How to tell when your Seiko watch was made (Part 2)

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In my previous article on how to date your Seiko watch, I mentioned the nifty Jayhawk’s Production Date Calculator. In most cases it should return the correct date of manufacture.

However, there are circumstances in which the calculator may give you inconclusive or erroneous results. Or no results at all. When that happens, I would resort to what I call “dead reckoning” or rough estimation.

Dead reckoning is similar to navigating your way at sea by orientating yourself with the heavenly objects like the sun, moon and the stars. You won’t be accounting for wind conditions and at best your estimate may be a few miles off your actual position. That’s when a GPS unit comes in handy! 😉

Manually estimating the production date of a Seiko involves the element of anachronism. What is anachronism? Basically, it is the utilization of an event, a person, an object, language in a time when that event, person or object was not in existence. In other words, an anachronism is something that occurs out of its proper time. The chronological error of an anachronism can occur in either direction; it can result from something from the past being represented as if it belonged in the present, like an archaism, or it can result from presenting something at a time before it actually appeared, occurred, or existed.

And anachronism is the key to manually estimating the production date of your Seiko watch.

An example would be saying that a digital LCD watch was produced back in 1964 or claiming that old Kinetic watch in your drawer was purchased in 1983. Or an eBay seller proclaiming a vintage Seiko 7T59 quartz chronograph as a brand new model from 2003. In actuality, digital watches were only commercially available in the middle of the 1970s. Seiko Kinetics, originally branded as “Auto Quartz” and “A.G.S” (Automatic Generation System) only appeared at the end of the 1980s. As for the prized and short-lived, rare 7T59 chronograph models, they were only made between 1991 and 1993.

Putting it in another way, it’s like saying the iPhone was already available in the 1990s or Microsoft Windows 7 users were running the operating system in 2004 (neither are true!). Eagle eyed movie buffs are quick to point out anachronisms in movies and you can read about them under the “Goofs” section for the movie title in the Internet Movie Database.

OK, now that you basically know what an anachronism is, let’s learn how to date your Seiko watch manually!

To perform a dead reckoning dating of a Seiko watch, the five things that you need to know are:

  • History of the caliber
  • Reference number chronology
  • Watch markings
  • Watch design
  • Signs of aging and wear

History of the caliber

Knowing when the caliber was first made and ended production would the first useful clue.

A very straightforward example is the 7002 automatic diver which was introduced in 1988 to replace the aging 6309 model whose production years ran from 1976 to 1988. The 7002 had a market life span of eight years and was shelved by mid 1996 (replaced by the current 7s26 caliber).  Therefore all 7002s couldn’t be made earlier than 1988 nor later than 1996.

SDS097K1 SKX171K1

The 7002-based SDS097K (left) and its successor model, the 7s26-powered SKX171K (right). Note that the 7002’s crown position is at 4 o’clock and lacks a day calendar display. Pics courtesy of

Another good instance would be the famous 6138 and 6139 automatic chronographs. Seiko introduced these robust and workhorse calibers in 1970 and 1969 respectively. Neither calibers never made it to 1980 and to my best knowledge, Seiko ceased making 6139s between 1978 and 1979.

Why were they discontinued? My guess is these calibers were getting more costly to manufacture and at the same time, Seiko wanted  to push its quartz technology to the watch buying public. Maybe at the time they thought that mechanical chronographs were obsolete and quartz was the way to go.

The discontinuation of the 6138 and 6139 movements also unfortunately spelt the death of affordable Seiko automatic chronographs, much to the disappointment to Seiko mechanical watch fans. Currently, Seiko only offers automatic chronographs for its higher end lineups, such as the Brightz (caliber 6s28), Prospex Flightmaster (caliber 6s37) and the “Rolls Royce of Seikos” – the magnificent Seiko Credor (caliber 6s37).

6138-0010-04 6138-0011_caseback

An early 6138-0011 from Oct 1970 (left) and a late production 6138-0011 dating to Apr 1977 (right). Note the “waterproof” marking on the earlier watch’s caseback and “water resistant” on the other one.

Complications in dating a Seiko watch will arise when production of the caliber hits 10 years or longer. Generally, Seiko doesn’t continue making the same caliber for longer than 8 years unless the caliber itself is profitable to manufacture or it came up with a replacement caliber.

Take for example, the 7T32 alarm chronograph. It first debuted in 1988 and was discontinued sometime in 2002. Therefore, if the a 7T32’s serial number starts with “1N”, you could narrow it down between 1988 and 2002. It cannot be 1981 because this caliber wasn’t available yet! Neither can it be 2008 because the caliber was already discontinued six years earlier.

This unfortunately leaves you with two possibilities – either November 1991 or November 2001. Obviously, this is not going to be very helpful because the correct year of production has to be either one of them but not both! Try to enter the caliber and the serial number into the Production Date Calculator and it will assume that the watch is from November 1991.

So how do you determine which is the correct production year? We take a step further by knowing the chronology of the watch’s reference number.

Reference number chronology

When faced with the above dilemma, the next logical choice would be to know the chronological order of the model. This is not easy to tell unless you have seen photos of models of the same caliber to serve as reference.

Early Seiko 7T32s have reference numbers beginning with “SDW” and followed by three digits while the last 7T32 models ended with “SDWG” with two trailing digits. The digits start from the lowest order to the highest order. When Seiko runs out of reference numbers, they would append a new alphabet starting with the letter “A”.

In this example, a 7T32 model with the reference prefix “SDW” obviously predates one with a “SDWA” prefix. In the same manner, a model that has the prefix “SDWF” would be a much later model than a “SDWB” and so on.

If you are able to determine that your mystery watch has a reference prefix e.g., “SDWF”, you can be sure that your watch is a late model 7T32. Therefore your watch would be a November 2001 production and not from 1991.



Three 7T32s arranged in chronological order. The SDW379P (left) predates the SDWA65P (middle) while the latter in turn, predates the SDWC02P (right). Pics courtesy of

The same model numbering convention holds true for other Seiko models. When the company dropped the 7T32 caliber in the early 2000s and replaced it with the 7T62, it designated the first batch of 7T62s as the SNA-series. As mentioned earlier, Seiko assigns a running prefix number for its new models until it runs out of numbers. Thereafter, it would append an additional character into the reference prefix, starting with the alphabet “A”, as in “SNAA”.

Six years have passed since first SNA models rolled out the factory assembly lines and at the time of writing, the most recent models have the “SNAB” prefix. In a few months from now, you’ll find 7T62 models with reference letters starting with “SNAC” and perhaps, “SNAD”. This will continue until Seiko decides to discontinue the 7T62 caliber and replace it with a new one. Its replacement caliber will of course, have different reference letters.


Two 7T62 alarm chronographs side-by-side: An early Seiko Sportura SNA137P (left) and a very recent model SNAB69P (right). Watch photos courtesy of

Watch Markings

When the watch’s reference number is unknown, there are certain visible clues that can help you zero in the watch’s production year. The key is in the watch markings. For instance, in the 70s and 80s Seiko typically uses the word “Seiko Quartz” or “SQ” to denote that the watch is a quartz powered model.

The 80s was particularly Seiko’s golden age for their analog quartz models. In fact,  the Japanese watch giant  was capitalizing on its solid reputation as the world’s largest producer of analog quartz timepieces. The words “Quartz” and “SQ” also served as a selling point and differentiated their quartz models from their automatic counterparts.

By the mid 1990s, Seiko had already carved itself a solid reputation as a quartz watch manufacturer. Seiko was churning out more quartz timepieces than mechanical ones and to the masses, a Seiko watch is generally associated with a quartz movement.

m_dialcloseup m_claspwriting

A beautiful and rare 2A22-026A Professional Diver’s 200m. The “Quartz” and “SQ” markings on the dial and bracelet clasp respectively are visible clues that this watch was from the mid 80s, Pictures courtesy of Thian Wong.


Seiko probably felt they longer needed to mark their quartz products with the words “Quartz” and “SQ” so both labels were eventually dropped. Since the mid 1990s, all Seiko watches are generally quartz by default. There are also some exceptions to this rule. For instance, the SHC015P and SHC033P divers are still marked as “Seiko Quartz” for certain export markets. I presume the Seiko company did this to distinguish them from their 7s26 automatic divers as both models have strong resemblances to their automatic counterparts.

Currently, all Seiko watches are  quartz models except if the movement type is indicated on the dial. Therefore, if the dial doesn’t say “Automatic”, “Kinetic”, “Thermic”, “Solar”, “Direct Drive” or “Spring Drive” then you can be sure that the watch is battery-powered quartz. This applies to all current Seikos, from their most affordable generic quartz watches to the high end Grand Seikos.

Some vintage quartz divers come with battery change year markings on their casebacks. If the watch caliber’s battery life is rated for five years, there should be an indentation mark to indicate the approximate next battery change.

This information can be very useful in getting the watch’s production year right. The photo below shows a vintage 7C43-6020 Professional Diver’s 200m. You can see the battery change markings on the caseback ranging from 1995 to 2004. The dimple mark is stamped on the year “95” as the 7C43’s battery life averages 3 years.

7C43-6020 dated Aug 1992

An equally gorgeous and rare Japan market, Professional 200m diver’s watch made in 1992. Photo courtesy of Ty Maitland.

Watch Design

As with fashion, hairstyles, music and popular culture, watches also undergo design trends and fads. Getting the production year right purely based on the watch design is not that easy but you can still make educated guesses if you know a thing or two about design elements in its time.

For instance, LCD watches were the craze in the mid 1970s and Seiko produced pretty good classic LCD timepieces during the era.

Therefore if you have Seiko watches looking like in this picture below, there’s the element of certainty that they were from the late 1970s to the early 80s and no later than that.

1970s Seiko Quartz LCD watches

A trio of well preserved Seiko LC digitals from the 70s. Seiko gradually phased out LCD watches with metal cases and bracelets by the mid 1980s.

Throughout the 1980s, Seiko made quite a number of analog-digital quartz calibers. The analog-digital trend unfortunately also faded by the early 1990s in favor of full analog quartz designs. Currently Seiko has only two analog-digital calibers left in its stable – the world-time H023, which is nearing its end of production life and also its latest H024 caliber.

H556-5029 7A28-702A

If your watches look like these, you can be sure that they were from the 1980s.

A memorable example is the “moonphase” display trend on watches in the late 1980s. Practically almost all manufacturers (even the Guess fashion brand) had moonphase dial watches back then.

The moonphase fad had died down by the late 90s and to my best knowledge, currently only Citizen has moonphase models in their upmarket quartz and Eco-Drive Campanola line and of course, a handful of fine Swiss mechanical watches.

7F39 7A48-5000

Two examples of forgotten moonphase Seikos from the early 1990s –  a 7F39 (left) and a 7A48 (right). Seiko no longer made moonphase quartz watches since then.

As Seiko has made countless models since the last century, it is not possible to detail every possible style in this article. However you can at least scope the production year within one decade if you’re familiar with the watch styling.

As with other brands, Seiko watches also undergoes many stylistic changes over the decades. You could also browse through Jayhawk’s Watch Database and see if your watch or a model like it is listed there. Here are some additional tips that you may find useful:

  • A watch marked as “Seikosha” instead of Seiko is likely to made in the early 1960s or earlier.
  • A Seiko that has a 7-digit serial number is likely to be made in 1968 or earlier.
  • A Seiko that’s marked as “waterproof” is likely to be made before mid 1971.
  • A Seiko that uses Promethium-147 or Tritium radioactive luminous compound (instead of the non-radioactive LumiBrite) is likely to be made before the mid 1990s.
  • A Kinetic Seiko that’s labeled as “AGS” or “Auto Quartz” is likely to be from 1996 or earlier.
  • A Seiko 5 with a solid stainless steel caseback (as opposed to glass display back) is likely to be made well before 2004.
  • Some Seiko 7s26 divers, like the SKX011K were introduced earlier but were later dropped from the market and replaced with the SKX011J. In most likelihood, an SKX011K predates the SKX011J version.


Signs of aging and wear

Although estimating the production year of a Seiko watch could be done by looking for signs of aging, wear and tear, this is a very subjective and by no means a foolproof method for determining its age.

Generally, a ten year old watch or older would show telltale signs of its age in the form of case scuffs, dents, scratches on the glass and bracelet, non-working functions, faded dials, rusty watch hands, casebacks, etc. On the other hand, a relatively new watch could also accumulate those scratches, dents and cosmetic flaws, depending on the manner the previous owner wore his timepiece.

One way is to judge the condition of the dial. Watches that have lived a long rough life have a tendency to have faded dials and bezels, especially if the dial has been exposed to the sun daily for years. It’s not just the heat but the sun’s ultraviolet (UV) rays that will cause dial fading.

Here’s an example of an old SKX025J that predates the SKX025K that is sold today. The watch is non-functional and the eBay sellers sold this as a parts watch.


An early model Japan-made, SKX025J mid-sized diver. This watch was probably made between 1996 and 2001.


Manually tracing the production year of a Seiko watch can be very tricky at best. If you have a relatively little known caliber or model you may be forced to resort to estimating by the watch design and text markings.

If all fails, post a question in the Seiko & Citizen Watch Forum as there will be a few kind and helpful members who may recognize the caliber or watch model. :-)



Related article(s):  How To Tell When Your Seiko Was Made (Part 1)

Originally posted 2008-07-16 20:29:46.

Leave a Reply

  1. Thank you for you help. Did the markings I mentioned tally with an original watch. Also the slight play of the bezel across the face it actually click when I move it. Is that normal. Lastly how long approx. would a SKX013 run after wearing for a day?


  2. Hi Mark White,

    I was away on a trip to Borneo at the time you sent in your question and I apologize for the belated reply.

    The 2620 is a quartz caliber from the late 1970s, but I’m not sure how long Seiko made the caliber before it was discontinued. It’s a simple gents’ watch with 2 jewels and no day/date calendar. I’m inclined to think that your watch was made on August 1978. It was fully Japan made by Seiko’s Daini factory. I’m sorry I can’t provide you with its history as it was considered one of the generic Seiko quartz watches in its time, nothing really significant about it.

    hope this helps,

  3. Thank you so very much for the info on the Seiko 5126. I don’t know how you find the time to provide so much detail to so many people but I’m so glad you do. I’m surprised to learn the watch could be valued at up to USD250 and glad I don’t have to worry about wearing it or insure it but really, this watch is priceless to me because of the connection to my wife’s dad. I will continue to wear it and pass it down to my son. Thank you again and I hope you enjoyed your vacation in Borneo!

    • Hi mike s,

      You’re welcome. :-) There are very few surviving 5126 watches today compared to other calibers of its era and I didn’t know about its existence until I found that Seiko 5 Sports 5126-6010, which cost me less than two hundred dollars (US). You can’t put a price to sentimental value, therefore it would be a good idea to have your watch serviced, if you haven’t done so. The rubber gaskets would have become brittle by now and the original lubricants could have gelled up over such a long time. Have its accuracy checked and the movement regulated for accurate timekeeping too.

      Seiko’s old calibers are really robust and long lasting. I’ve had two 7s26 Seiko 5s fail on me despite careful wearing, but none of my vintage Seiko watches have let me down so far.

      best regards,

  4. Very Informative and helpful site! I recently got the Seiko bug and picked up my first old Seiko automatic for $25 which I think is a bargain. It’s a 7005-8032 17 Jewel Date, water resistant, with the serial number 424664 so if I’m reading your guide correctly this would make it a Feb 1974, with production number 4664 for that month? Also has Japan -M under the serial number on the caseback. Not sure what the M stands for. It’s keeping great time and only needs a new crystal to bring it up to scratch.(Pardon the pun)
    I’m busy saving now for a 1968 Grand Seiko Hi Beat:) It really is a disease this Seiko collecting! Thanks for an excellent website.Best Regards Dave Baldry

  5. Hello! I am having an insanely difficult time trying to figure out any of the details of my Seiko. I inherited it from my Grandmother when she passed away almost 10 years ago. It is in great condition and keeps time perfectly, and I would like to know more about it. The face is signature Seiko blue, and only the word “Seiko” appears on it. “Twelve” is denoted as ||, while the rest of the numbers are only |. The back says:
    JAPAN – H (and a mark like a “z” appears here)

    I know from your posts that it was made in August of the ninth year of some decade, and was #2581 of that month. I can’t find any watches like it through all of my online searching, and am hoping you can shed some light on it’s story. Thank you in advance!

  6. Can you help with info on a Seiko I got?Age,value,collectibility,etc. I paid very little but watch is only in fair condition,dirty,and didn’t run.Now after removing back cover and cleaning, everything works and it keeps perfect time. Square, gents,dress watch,steel adjustible band (SQ on clasp). Analog face; second hand; day(English-French)-date @3o’clock; SQ on face@6o’clock;no #s on face only slashes. Back:water resistant stainless steel 8123-5129 AO inside a square box 330999. Inside:adjusted five jewels Seiko Time Corp. Japan A lightning bolts. On face underwhere 6 would be: 8123-5140T and lightning bolts. Any info would be greatly appreciated. Thanks!!

  7. Hi, I have a ladies Seiko watch the numbers are, at the bottom, 740120, then above the mov’t Japan, is 2E20-7329 RO. I hope you can tell me something about it, thanks Jeanne

  8. please tell me something about my watch…
    this is all the info that appears at the back of my watch…
    WP 196050
    ST.STEEL 7009 A4KY

    _i dont know if its real seiko watch…
    My watch is SEIKO 5 sport watch

    i feel bad, coz i spend mony without knowing if its real one…

    • Hi acrobot,

      I sincerely apologize for the belated response due to unavoidable health circumstances. I don’t think there were any counterfeit 7009 caliber Seiko 5s in its time, because there’s no record of anyone having one and describing one in watch forums. However, if you are able to take clear pictures of your watch (front and back) and upload them to the TinyPic image sharing site and reply to this comment with the link to your images, only then I can ascertain if your watch is truly genuine.

      Right now all I can tell you is that your watch could have been made on Sept 1991. Seiko used the 7009 extensively for its low end models (including the Seiko 5) until 1996, when it was replaced by the 7s26 caliber that’s still being used to this day.


  9. As many have said earlier, this is indeed a valuable and hard worked resource on Seiko and relevant stuff, amongst other. However I was wondering, if we are to date our Seiko’s the way you tell us to, how can we do it for quartz watches as there is no resource for that on the web which contains complete list of quartz movements production start and stop dates, can you help us out and create such a list from your extensive experience?

    Secondly, are Seiko movements only are used in Alba watches or there are some Alba’s own movements too? And can we date Alba watches the same way we can date Seiko’s as you have taught?

    Lastly, I have a titanium scuba 200m water resist date Seiko which I believe was a Japan only model, can you provide approx. production date for it?

    Case number is 7N35-6100[A0] Japan A
    Serial number is : 471438


    Zeewaqar Khawaja

  10. Hello Seiko Seekers!!!
    My dilemma started when I acquired a Seiko ladies watch from my mother. I don’t know how long she’s had it but she gave it to me to have it appraised. None of the places I went to gave me concrete answers because they don’t know much about vintage seiko watches. I would like to describe it to the best of my ability: Its gold toned with stainless steel back, has a small quartz or diamond in the 12’o clock(not sure), no numbers in front, only small lines, no seconds only hour and minutes hand, and the serial # is 950790, 4N00-5060 with the letters RO inside a box frame next to these numbers. Its in xcellent condition but i don’t know to turn it on because i fear that i might break it. Should I hold on to it because it’s rare or unique? or i can sell it but i don’t know its value. My Mom tells me to research about it before i make drastic and impulsive decisions. PLEASE HELP, QUARTZIMODO AND SEIKO SEEKERS!!

  11. Hi – The Online form doesn’t appear to work at the moment. I have a Seiko 5 Sport Speed Timer (SN 290419) that I’d like to part with (Trade or Sell) in order to aquire more Seiko’s. I’m very new to the watch forums. Suggestions to it’s fair value would be greatly appreciated. I have dealt online with a lot of Muical instruments – but I imagine, there is a much more deliate protocal with watches.

    regards Seratone

    • Hi Seratone,

      Thanks for dropping by my blog and raising the question about your Seiko 5 Speedtimer.

      With only the serial numbers to go with, nobody knows the model that you own because Seiko made several models bearing the Speedtimer name from different calibers.

      In fact, I myself own a few Speedtimer models from the 6139 and 6138 chronograph families. You need to know the caliber/caseback details that are found at the back of your watch first.

      Saying that you have a Seiko 5 Speedtimer for sale is like having a Fender Stratocaster for sale, giving only the serial numbers in the advertisement.

      What year is the guitar from? Is it a pre-CBS or post-CBS model? Does the guitar happen to be the short-lived, “The Strat” from the early 80s? Is it a vintage 1954 reproduction or a Mexico made Stratocaster with a Floyd Rose tremolo and humbuckers? Rosewood or Maple fingerboard? Active or passive electronics?

      It’s the same when it comes to Seiko watches. You need to be more elaborate in your description.


  12. Its been a while since we have heard from you QUARTZIMODO , are you ok? Hopefully you will be recovering well from the health condition you were suffering from. GET WELL SOON !! :)

  13. My friends asked if I could find some info on this watch. Its a quartz 4130-9001, 505413. From what I’ve gathered, it was made Oct 1975? yes/no? In it’s day I guess it was a pricy watch, how bout now? Thnx, Dennis

  14. Hello, I have a Lassale 5Y30-5K69 RO 060242 I purchaced it new back in the late 80s or early 90s for around $300 and was trying to find out what it would be worth today.

    • Hi Andrew,

      Thank you for the question. You can try to find out the value of your Lassale watch by searching for it on eBay. Because the Lassale series watches come in several caliber/movement types and differing metals (most are 18K gold; others in stainless steel) and in various conditions, it’s hard to say how much yours is worth now. All I can tell you is that your Lassale was most probably made on June 1990.

      I’m not an expert in the Lassale lineup and the first thing I would do is find the average selling prices on eBay. :-)


  15. hi any info on my Seiko Kinetic 5M62 0AF0 Unique number 280720
    only ever seen one other and unable to trace on Seiko website

    • Hi dez,

      You have one of those stylish, asymmetrical cased Seiko Kinetic sports watches. The model code for your watch is SKA187P and was been made on August 2002. Seiko does not list your model on its official websites as the company makes too many models for them to list. They are not willing to go through the trouble of listing archived or discontinued models on their websites; so what you see on Seiko’s websites are generally the currently selling models.

      hope this helps,

  16. I have a 7N43-9048 with a serial# of 860254. I know nothing about it, it was a cheap 10 dollar garage sale buy. Any information on it would be great.

  17. Hi,
    I have a SEIKO 5 KY 7009-3170 with serial nr 009613 can you tell me from which year is it? and i would like to know what does A2 mean after the model nr. Thank you in advance.

    • Hi Paul,

      In most likelihood, your Seiko 5 7009 was assembled in Hong Kong on October 1990. Some Seiko experts believe that “A2″ refers to Seiko’s watch case tool and the procedure required to open the caseback but there’s no real evidence to support this assumption. “A2″ could also mean the watch’s caseback is a 3rd generation type (provided older versions of 7009-3170 also exist with “A0″ or “A1″ instead of “A2″). The only way to be certain is to ask Seiko Japan’s officials; but whether they’re willing to give the straight answer is another matter. :-)


  18. I have a man’s Seiko Quartz watch with white face and numbers not nurmals. It also has no date. Here is the information on back. I would like to know approx date of it if possible. Or anything you might know about it.

    baseMetal St. Steel back
    V700-8A10 RDin a box
    Mov’t Japan

    • Hi Shirley,

      The V700-8A10 is a simple gent’s quartz dress watch on a leather strap. This watch has a Japan made movement but was assembled in Hong Kong (China). It requires a Seiko or Maxell SR616SW 1.55 volt battery which will run the watch for approximately 3 years. There’s nothing of historical significance behind this model; it’s one of the countless quartz dress models which Seiko made in the past. As such, it has little value to it and pre-owned ones usually sell between USD50-70.

      Your watch was likely to be made on April 1995.

      Thanks for asking!

  19. Hi. I have a Seiko Bell-Matic with Serial Number 300772 and is 4006-6021. May I know when it was manufactured. Thanks!

    • Hi P Sanidad,

      Your Bell-Matic was produced on Oct 1973. Seiko Bell-Matics are easy to date because their production didn’t last over a decade, beginning from 1967 and ending sometime in 1977 or 1978. I have two 4006’s myself and they’re great watches! :-)


  20. Hi , enjoying reading ur blog. I have a seiko 5 with serial number 2N3639 and case number 7s26 0440 , accorind to ur previous artical i can tell it was manufactured on Nov 2002 (correct me if i am wrong) . I just curious about where was the movement assembled ? Thanks in advance .

    • Hi CY,

      Your Seiko watch carries the reference prefix SNXxxxK of which the lowercase “x” refers to digits, e.g. SNX113K, SNX115K, SNX551K, etc depending on the actual model. Early SNX Seiko 5s had a stainless steel caseback instead of the see-thru display back. As such, November 2002 is very likely to be its production month and year.

      Basic Seiko 5 watches with the 7s26 automatic caliber have their movements made in Singapore (7s26A), while 7s26B and 7s26C versions are assembled in Malaysia. Regardless of the movement, Seiko 5 watches are cased in Hong Kong except for certain models that are purported to be wholly assembled in Japan.


  21. Hello. Please excuse this question regarding a watch I bought for my son. It is a Pulsar, so I hope you can find the time to help. I bought a PF3291. It is an analog chronograph with a 12 hour alarm. I have tried repeatedly to set the alarm but it never sounds. The alarm seems to function solely as a regular watch. I bought the watch on eBay and if I mail it back for a refund I am required to pay for shipping and a 10% restocking fee.

    • Hi Watchmego,

      I’m not familiar with individual Pulsar watches as this brand is marketed exclusively in the U.S. However, I managed to track down the model PF3291 and found out that it uses the Seiko 7T62 alarm chronograph movement. The 7T62’s alarm subdial has its own timekeeping and it can operate separately from the watch’s main time. I own a Seiko watch with the 7T62 caliber and I found that it’s tricky to set the alarm compared to its predecessor, the well loved 7T32 caliber.

      Instructions on how to set the your Pulsar’s alarm can be found here.

      good luck!

  22. Many thanks to your response. And how can i differentiate which version of caliber from the caliber bumber , in my case 7s26 0440? (i am malaysian and i would be happy if mine was made in my homeland :) )

    • Hi again CY,

      You can only determine the movement version by opening up the caseback and looking at the watch’s oscillating weight. Seiko 5 models made from 2004 onwards have a see-through, glass display back and you can view the oscillating weight. A 7s26A movement would have “7S26A” and “Seiko Time Corp” engraved on the weight. As far as I know, all 7s26A movements are Singapore made (1996-2006), while 7s26B and 7s26C variants are assembled in Malaysia. Since your watch is from 2002, it would have a Singapore assembled movement.


  23. Hey there, I really like that you’re doing these articles.
    I’m having real difficulty with determining the age of my Seiko..
    Here is the back panel:
    H601-5360 [R0]
    JAPAN MS (thunderbolt logo)

    I believe this watch to be AT LEAST 20 years old, so my best guess so far is that it is from August 1982. The ‘0089’ suggests to me that it is a very early unit in the series. It has no markings for gold karat, but I would love to find this out, so that I can have a rough idea of what this may be worth as gold.

    • Hi Query,

      Thanks for compliments! You got the manufacturing date correct, as the H601 (“H” stands for Hybrid analog/digital display) caliber was from the early 80s. “0089” means that your watch was the 90th piece that was made on Feb 1982 for this model. The first watch off the production line will always be stamped “0000” while the second piece gets the number “0001” and the 10,000th watch would have “9999” stamped (although I’ve never seen such an example); therefore you’ll have to add one to the last four digits.

      Your watch is not made of solid gold, period. Seiko real gold watches would have “18K GOLD” stamped on its caseback; and if it has a gold plated case you would see “SGP” (Seiko Gold Plated) marked. On the other hand, a Seiko watch having a gold-colored dial, hands or dial markers but has a stainless steel case, will have “ST. STEEL” or “ST. STEEL BACK” marked on its caseback, like on your watch. As for its value, square cased H601 watches fetch about USD150 or less on eBay, depending on its condition. Here’s an example of a full luminous dial, H601.

      hope this helps,

  24. I have a Seiko and on the back it is as follows
    water resistant
    base metal
    st. steel back
    5y91-5030 [r7] ?
    japan tl (a symbol of some sort)

  25. Hi,
    I have an old Seiko 5 Automatic from my grandfather. He gave it to me when he went to Japan in the 80’s, if I remember right. It is working perfectly well until today though it is just kept in my drawer. The etched markings at the stainless steel back are:
    1. 499885
    2. 6309-8840
    3. A6 enclosed in a box
    4. TL
    5. Water Resistant.
    Based on your article, this should have been manufactured Sept of 1984, right?
    I have two other questions though:
    1. Why is the marking on the face different from the marking at the back as to the digits following 6309? The marking in front or in the face says 6309-820N TH. Is this a fake SEIKO 5?
    2. would it be possible to know from any of the markings on the watch if the watch was made in Japan, HK or anywhere else?
    Thank you so much for your very informative article.

    • Hi Bingo,

      Thanks for the interesting question. I duly apologize for the late reply as I’ve been away for sometime and I hope you’ll bear with me. OK, let’s cut to the chase. Firstly, your date estimation is correct; your 6309 was indeed from September 1984.

      Seiko marks the front dial and caseback codes differently for a reason. In most cases, several designs are available based on a common caliber/caseback type. By “design”, I’m referring to the dial color and style. So you can find a dozen different 6309-8840s, but each model has its unique dial code to signify the dial design/color. Having a common denominator (the caseback code) simplifies things for Seiko, in addition to cost savings by not having the caseback engraved with the exact dial code for every single variation made.

      Seiko collectors usually use the rear caseback code to denote a particular model and not by the dial code, which is the “6309-820N” that you see on the dial. That is why the two identities don’t match. All other features of the watch are the same; the crystal, crown, hands, case and bracelet. I don’t think there were ever fake 6309s during the era the 6309 caliber watches were made. Since you inherited the Seiko 5 6309-8840 from your grandfather, you can safely assume that it’s all-original.

      The 6309 debuted in 1977 and earlier batches were assembled in Japan by Seiko’s Suwa factory. By the mid 1980s, Seiko shifted the production of their 6309 models to Hong Kong (China). While the movement and parts were sourced from Japan, the encasement or final assembly was done in Hong Kong in order to save on production costs. How to tell if your watch was Hong Kong assembled? The absence of the word “JAPAN 6309″ on the front dial. Watches that were assembled by Seiko Japan will have “JAPAN” on the dial and “JAPAN” on the caseback.

      Take note that only US export models will have the exact country of manufacture and assembly printed on the dial as per the U.S. Federal Trade Commission’s import labeling laws. I’ve seen examples of Seiko 7002-7009 divers bearing “Mov’t Singapore Dial Japan Cased Hong Kong” (all in uppercase letters) printed on the dial, while “Mov’t Singapore” is engraved on the caseback. Since your watch is a non-US version, Seiko simply leaves out the country of manufacture from the dial and caseback, presumably to give the dial an uncluttered look.

      Hope this fully addresses your curiosity! :-)

      best regards,

  26. Hello,
    I spent a lot of time reading the postings after reading your article. Great information indeed…

    I would like to inquire about information and specs regarding a SEIKO watch I have.
    My wife purchased for me around 1993-1995?
    It has on the back these markings:

    Water Resistant
    7T34-7A40 with a A4 in a box

    The dial is all white with 4 dials: alarm, stopwatch, date, and seconds.
    There are two markings on each side of the 7 O’clock mark:
    “MOVEMENT JAPAN”(left) and “7T34″ (right) of the digit.

    There are two more markings at the 5 O’clock digit on each side:
    -7A3w(left) and “R 2″ (right)

    I am pretty sure the date is going to be April of 1994. What I am curious about is not reading much of the 7t34s unless they were standard run-of-mill movements. Just not sure what to make of it.

    I solicit your expertise and know you are the expert.

    Kind regards,

    • Hi Marty,

      Thanks for submitting this interesting question and I apologize for replying late. I don’t get too many queries regarding the rarer 7T34, which is a sibling to the more common 7T32 alarm-chronograph. April 1994 is indeed, the correct production date for the 7T34. It appeared about the same time as the 7T32 and was simultaneously discontinued together by 2002. One of the last models was the SEH095P that was sold only in Southeast Asia under the Seiko Criteria sub-brand. The sole difference between the two is the circular calendar sub-dial instead of the more conventional digital date in a window on the dial. All 7T34 models were given the prefix “SEH”, which differentiates it from the 7T32’s “SDW”.

      The reason you don’t see too many 7T34’s made was because Seiko made them in much smaller quantities and in fewer variations. While the first 7T34 model made was named the SEH001P, its final model was perhaps the SEH095P. There was never an “SEHA” prefix for the 7T34 because Seiko didn’t make many variations based on the 7T34. By contrast, the 7T32’s inaugural model had the prefix “SDW” and finally ended with “SDWG” (there was never an “SDWH”). When Seiko stopped making the 7T32 caliber, it was replaced by the 7T62 caliber which bears the model prefix “SNA”. The 7T62 is a simplified version of the 7T32 with less one push button and one crown deleted; possibly for cost savings. Alas, the 7T34 had no successor as it wasn’t selling very well. I guess more consumers preferred the traditional date display instead of a tiny hand pointing at even tinier date numbers in a circle. I have three 7T32s myself at the time this caliber was still sold, but found only one retailer which had an SEH005P, which had an all-black dial and a black E6 rotating flight rule bezel. Although 7T34s are quite rare, they are not necessarily valuable in the collector market.

      Like most quartz Seiko watches from the 1990s and beyond, the 7T34 was assembled in Singapore with the parts imported from Japan. This is a good watch, but wasn’t as popular as the 7T32 with the traditional date window – that’s why you read very little about it. :-)

      hope this helps,

  27. I have a Seiko Automatic 6309-8099 815783, it has a brown dial w/ day & date and beveled crystal. I found this watch over 20 yrs ago while hiking in the mountains. I would like to know it’s date of manufacture and any other pertinent information you might be able to provide, expecially it’s value as I am considering selling it. Interesting site you have here, I never knew there were so many watch enthusiasts out there. Do you research other watches as well? I have 5 old pocket watches I would like to find out about. Thanks for your help!

    • Hi Marty,

      The old Seiko 6309-8099 which you’ve found is a U.S. export model. It’s made in Japan back in January 1978. The faceted (beveled) crystal was a trend throughout the 1970s and Seiko didn’t make faceted crystal watches until a brief revival with their Japan market, Spirit series in the mid 2000s. The 6309 is a robust workhorse movement but was considered an economical caliber. It has 17 jewels, was assembled by Seiko’s Suwa factory in Japan and neither hacks nor hand winds (fully automatic). It was one of the numerous styles which Seiko made in the 70s and your model has no particular historical significance, except that it’s “old school” and collectible to some people.

      The 7N83-0041 is a quartz ladies watch, styled after the Rolex Datejust for women. It has a classic look to it, fully Japan made. It probably dates back to August 1985. The third one (2P20-5809) is also a ladies’ dress model (U.S. version) and from the serial number it could be from March 1986 or 1996; but certainly no later than either year. Without pictures of the actual 2P20 it’s difficult to estimate the exact year as I don’t keep track of Seiko ladies’ quartz watches or their production history.

      I’m sorry I can’t shed any light on pocket watches as I’ve never been interested in them. :-(


  28. I just wrote you and then realized I had 2 other Seiko’s to ask about: Seiko Quartz 2P20-5809 with RO in a box, serial #630598 and Seiko Quartz 7N83-0041 with A4 in a box, serial #584618. Thanks again for all that you do!

  29. I have a seiko watch that I got from my grandmother. It reads as follows: SEIKO,200123,Base Metal Top,Stainless Steel Back,11-3409,>< (symbol that looks to triangles touching). I'm trying to find out when made, is it a real seiko, and if its worth something? Thank You! Andrea

    • Hi Andrea,

      Thanks for posting your question. The Seiko ladies’ watch that belonged to your grandmother is a Caliber 11A hand-winding (not automatic) dress model. It is a real Seiko because back then nobody made counterfeit Seiko watches. My mother has a Caliber 11A watch too, in running condition except that its original bracelet broke and there are no more replacement parts for it.

      Your mom’s watch was made by Seiko’s Daini factory on October 1972, which makes it almost 40 years old today. There’s an interesting article on the Caliber 11A which you can find here. Unfortunately Seiko women’s watches are not considered as collectible items; therefore they generally fetch less than USD100 on eBay.

      best regards,

  30. I have a Lassalle 5042-5049 S/N 500031. I got it in early 80’s so I suppose that is when it was made. It is Gold finish, with stainless back. I am assuming it would be gold plated not solid gold in any way (maybe they put a stailess back for durability – or would a sold gold have gold back as well? I know it was fairly expensive, so I am curious about it.

    • Hi Chris,

      I think you made a typo and meant to say 5420-5049, because there Seiko made no such caliber as “5042”. The 5420 is a ladies’ quartz movement and yours was manufactured on October 1985, therefore you can’t possibly have gotten it in the early 1980s. Furthermore, Seiko acquired the Jean Lassale company’s watchmaking business only in 1982. Seiko 14K gold watches would have its caseback also made from gold; therefore since yours is merely gold plated, it is common for Seiko to use non-plated stainless steel backs. To my best knowledge, Seiko has never made gold plated S/S casebacks for its gold coated models.


  31. just have a question regarding a recent purchase of a skx779k black monster on amazon via cdi watches. back of case reads kg stainless steel 7s26-0350 ao sn 1d1974..on front dial 6pm left 7s26,right 2084rz,on ss bracelet 49x8gcz and stailess steel-z written on clasp..the back is completely polished,with no satin areas,with the raised wave..the watch came in a blue box with the seiko tag and tansparent blue protective sticker on the back,with protective tape on the ss band..the blue box had no seiko name on any part,inside or out but did look similar to a seiko 5 sports watch case,minus the ‘seiko’ name..just want to be sure this is an authentic watch despite the plain box it came in..also the push pin in the clasp fine adjustment seems very difficult the remove,including the jewler with no luck,any suggestions on how to proceed on that small glitch,thanks

    • Hi Brian,

      Congrats on your purchase of the Seiko Black Monster. :-) Your watch is from the “second generation” batch with an all-polished rear caseback and the cryptic “KG” initials (the early batches have no “KG” lettering and a matte, raised Tsunami logo at the center). It’s common for grey market Monsters (or any parallel import Seikos) to come in plain boxes as the original Seiko gift box is generally issued through authorized Seiko dealers. I’m quite certain yours is 100% authentic. It’s from December 2011 with the latest 7s26C movement, in case you’re curious.

      The Monster’s bracelet is said to be one of the trickiest Seiko bracelets to size due to the use of pins and collars but it can be done by an experienced jeweler. Reto Castellazzi has written an excellent tutorial on how to size the Monster’s bracelet, which you can find here. If you intend to have a watch retailer size the bracelet, print the page and let him follow the instructions.

      good luck!

  32. Hi I’ve just found my granpa’s watch and it would be awesome if i had more info on it. Thanks in advance for your help the s/n and model number is below.
    S/n 8d3685
    M/n 5y23-7000

    • Hi Sercan,

      Your grandfather’s Seiko watch is very likely to have been made on December 1988. While I can’t find references to the exact model (5Y23-7000), I have very few photos of other 5Y23 models. They’re mostly from the 1980s judging from the styling and they’re all manufactured in Japan. There’s not much to say about the 5Y23 caliber; it was a simple day/date quartz movement with one jewel. It requires a Seiko/Maxell SR920SW silver oxide cell or an Energizer #391 equivalent.

      Most 5Y23 Seikos were made as dress watches with a select few having sporty looks. There were no Seiko diver’s watch that was made from this movement.

      hope this answers your question,

  33. Hi, I bought a Seiko H566-5029 in 1983, what an awesome watch. I have just managed to buy on e-bay an unworn one with the manual and the original box for $202

  34. Hello,I have 2 Seiko Watches,but I don’t know if they are original or replica and can you also tell me the price if you know it.The first watch is Seiko 5,crystal,water resistant,and on the back it says ” 170319 KY Stainless Steel 7123-8510-P A1″.
    The second have a date but only the day and it’s Seiko 5 Automatic,Japan movt.On the back it says “701692 Stainless Steel , Water Resistant , Japan ES 7S26-3040 F ”

    Thank you :)

    • Hi Plamena,

      There were no incidences of fake 7123 Seiko watches that I know of. You have a rather unique Seiko 5 as it’s one of the very few Seiko 5 watches with a quartz movement. However, for your 7s26-3040 there is a small probability that yours might not be authentic (although I’m inclined to believe otherwise) unless I get to see actual photos of your watch.

      I’m afraid I don’t quite understand what you meant by “The second have a date but only the day” because all Seiko 7s26 automatic should have both a day AND date calendar.

      best regards,

  35. As many have said earlier, this is indeed a valuable and hard worked resource on Seiko and relevant stuff, amongst other. However I was wondering, if we are to date our Seiko’s the way you tell us to, how can we do it for quartz watches as there is no resource for that on the web which contains complete list of quartz movements production start and stop dates, can you help us out and create such a list from your extensive experience?

    Secondly, are Seiko movements only are used in Alba watches or there are some Alba’s own movements too? And can we date Alba watches the same way we can date Seiko’s as you have taught?

    Lastly, I have a titanium scuba 200m water resist date Seiko which I believe was a Japan only model, can you provide approx. production date for it?

    Case number is 7N35-6100[A0] Japan A
    Serial number is : 471438


    Zeewaqar Khawaja

    • Hi Zeewaqar,

      This is a terrific question. Unlike some Swiss manufacturers, Seiko never officially published a complete history of all of their watches and clocks that they produced. There were rumors circulating on watch forums that the company didn’t archive their legacy products properly and that many of their records were either “lost or missing”. You can however visit the Seiko Museum in Tokyo to find out more about Seiko’s rich history, but the watches and clocks that are displayed there are the milestone or technology groundbreaking watches and clocks; but not generic Seiko quartz or automatic watches from the past.

      Without assistance from Seiko Japan, the task of collating the entire history of Seiko quartz movements (and models) are usually left to Seiko enthusiasts.

      Vintage Seiko automatic movements are much easier to identify compared to quartz because:

      a) Collectors have more interest in them.
      b) Mechanical watches generally last longer than quartz and are easier to repair/overhaul.

      There are also exceptions to the rule. Seiko made fewer analog quartz movements in the early-to-mid 1970s compared to the 1980s and beyond, therefore it’s easier to keep track of them. Seiko all-digital watches are also collectible and there are websites that dedicate to early digital watches – not just from Seiko, but also from Citizen and Casio. High end quartz (HEQ) movements also have their place in some collectors’ hearts but there aren’t too many e.g., Seiko Lasalle aficionados around. Seiko also made quartz movements only for Seiko diver’s watches, e.g. the 7C43, 7C46 calibers. Since Seiko diver’s watches are very often discussed in forums, it’s easy to narrow down to the year that caliber was produced.

      The problem lies with “garden variety” Seiko quartz watches that collectors don’t take notice of, let alone have interest in them. You’ll need to gather information from as many owners of a particular model as much as possible in order to determine what would be the earliest month or year it was made. The more owners come forward and share photos of their watches, the more accurate it becomes in determining the history of that model. Unfortunately those who participate in watch forums tend to gravitate towards certain types of Seiko watches, e.g. chronographs and divers rather than generic dress watches. I actually learned more about lesser known quartz calibers from my readers than those years I spent in watch forums. :-)

      As for your second question, Alba is a subsidiary of the Seiko Holdings Group and therefore Alba watches can be dated using the same method as Seiko watches. The same goes for Pulsar and Lorus watches as they are also Seiko’s sub-brands. Citizen watches also follows Seiko’s numbering system; albeit their vintage models used 7 digits with the second two digits representing the month (“12″ for December instead of “D”).

      Watch brands outside the Seiko Group that borrow Seiko’s movements have their own serial numbering system. For example, the French watch brand YEMA once used Seiko’s 4S15 automatic movement for the Yema “Seaspider” divers’ watches but they are not serialized in the same manner as Seiko. Orient Japan has also used Seiko’s quartz chronograph movements (like the 7T32 and 7T62) but they have their own serial number format.

      BTW, your Seiko 7N35 Scuba 200m is very likely to have been made on July 1994. If yours is the one with a blue dial and gold accented hands, that would be the model SBBC053. It is a JDM Seiko model.

      best regards,

  36. Thanks Quartzimodo you have been very helpful :) and the Scuba watch I have has Grey Dial and gold accented hands, I own over 8 Seikos and around five Albas among a 100+ watch collection of mine and will love to share their pics with you :)

  37. Hi, great site and lots of info. I have a Seiko watch I bought in 1971 when I was in Vietnam, the markings on the back are : 6106-6006, 178298 & japan j, has a SS back with “water resistant”. The face is black indicates a DX 25 jewel, has a window with day of week & day of month, is self winding.
    she still runs great today, any info would be greatly appreciated.

    Thanks Mike

  38. Years ago my husband found a watch while he was demolishing an old building in Tasmania (Australia). We have been trying to find out what year it was made, could you please help.
    lorus water resistant
    mov’t Japan
    The whole watch glows after you hold it up to the light, so is it a uranium based watch?
    It is metal based I think and has the wind button at 3 o’clock.

    • Hi Sandra,

      I wouldn’t know when your husband’s Lorus watch was made because you didn’t furnish the 6-digit serial numbers. The V515 movement was used exclusively for the Lorus brand and many of them were Disney’s Mickey Mouse watches. It appears that these watches were made in the 1990s.

      There are no watch manufacturers that use uranium to light up the phosphorescent compound in the dark. Radium was however originally used in coating the hands and dial numbers in the early 1930s and was subsequently banned twenty years later due to radium’s radioactive toxicity. The lume material that your watch uses is most probably LumiBrite, a proprietary compound from Seiko that is completely safe and non-radioactive.


  39. Hi I was wondering if you can tell me approx when this Seiko ladies gold colour watch was made? On the back it says

    ST. STEEL + base metal
    1N00 – 1E09
    0 9 0 9 1

    Also is there anyway of telling if it is gold plated or what carat gold it is?


    • Hi Adele,

      Sorry for the late reply. I had to do some research on your watch until I finally managed to find a picture of your particular model. Your Seiko 1N00-1E09 appears to have been made on Sept 1990 and it was the 911st piece produced for that same model and month (the first piece always starts with “0000”, not “0001”)

      This watch is neither solid gold nor it is fully gold plated. It’s basically a stainless steel model with some gold accents on the bracelet links and gold toned hands and dial markers. Seiko watches with real gold will have the text “14K” or “18K” and “Gold” inscribed on the rear caseback.

      hope this answers your question,

  40. I have a watch which says Seiko, Water Resistant, Quartz on the white face. On the back: Eco Drive, Titanium (and a brass-colored globe). No model number, etc. The watch is titanium color (I guess) and has a clasp band. I couldn’t find any mention of a Seiko Eco Drive. Thank you for posting so much information.

    • Hi Larry,

      You have rather odd situation. The “Eco Drive” is a registered trademark of the Citizen Watch company and no other watch manufacturer can use that name. As such, there is no such thing as a “Seiko Eco Drive”. I suspect that somebody had lost your Seiko watch’s original caseback and substituted it with that from a Citizen Eco Drive watch, which happens to fit perfectly. I’ll need to see actual photos of your watch and you can upload them to and reply to this post with the link to your watch photos.


  41. Hello
    I have a ladies Seiko watch.The numbers on the back are as follows: 1N2986 and 1520 3339.This watch has not been worn often,still in the case and outside box.Can you please tell me when it was made?
    Thanks so much

  42. I own a women’s Seiko quartz “Sports 100″ watch, 2A23-0279 [A4]. The serial number number is 590879. Based on the excellent information on your Web-site, I assume that my watch was produced in September 1985.

    The face of the watch is a very dark-gray with white time markings, white hands, and a red second hand. It shows day/date, and reads “Seiko Quartz,” “SQ Sports 100,” and “Japan 2A23 // 0490″ in very small lettering along the bottom.

    The back of the watch reads “Water Resistant Base Metal Middle Plastics+Base Metal Bezel St. Steel Back.”

    The watch has a thin red bezel and the stem is located at 4:00 versus the usual 3:00. The band is bracelet-type in the very dark-gray color.

    I haven’t been able to find any information about my watch or find any similar photographs due to the colors (dark gray and red). Any information that you can provide about my watch would be very much appreciated.

    Thank you.

    • Hi Gayle,

      Thanks for the question. The 2A23 was a 1980s quartz movement for ladies’ models and Sept 1985 as its production date sounds about right. I don’t have any photos of your model and if you are unable to Google for the 2A23-0279, neither can I.

      I can however tell you that your watch was made for the North American market and the detailed (and verbose) description of materials used is typical of U.S. Seiko models. The 2A23 caliber is a simple 2-jeweled, quartz movement with a date display. It requires a Seiko/Maxell SR621SW or Energizer #364 with a battery life rated for 2.5 years. Like most 80s Seiko quartz watches, the movement has a trimmer capacitor for the Seiko technician to make very fine accuracy adjustments. When your next battery replacement comes, you might want to have the rubber gasket replaced and the movement geartrain re-oiled if you haven’t done so already.

      I wish I could tell you more, but unfortunately that’s all I know about this watch caliber.


  43. i have what i think is a older mickey mouse watch i have seen the older posts saying they are not colletable,and thats fine i do wish however to date it i got it from my dad many years ago and it was found laying in the bottom of my watch case he is the sn 752266 model 5p31-7009 it just brings up old thoughts of my dad i think i would give it to my son to hold on to thanks again

  44. Hello!
    is there a fake new seiko monster?
    i went to pertama complex last time and have a look at the new monster but it doesnt feels right.both the price a way cheap and the watch it self.ur opinion sir?
    sorry i drop u a message last time. =P
    maybe it didnt reach u.hehe

    • Hi amr,

      I’m not clear with your statement “the new monster” as I’m not sure whether you’re referring to a brand new SKX779K Monster or an entirely different model. What was the actual model? Was it on stainless steel bracelet or a rubber strap? Do you remember the actual watch store in Pertama Complex that you saw that particular watch? :-)


  45. Hi Quartzimodo,
    I recently bought a new old stock Seiko Baby Arnie H556-5029. the watch has never been worn, has the orginal box and manual. The serial no indicates that the watch was manufactured in April 1984. Is this model sought after by collectors, and what ould the value be.
    great forum,

  46. owh!Sorry for that.hehe.its actually the new release seiko monster to be more specific the srp315.the shop is mee seng if not mistaken.Thanks for the help sir! =D

    • Hi amr,

      That’s the new 4R36 Seiko Monster with the orange dial and black dial ring and black bezel. On eBay some Singapore based sellers are offering this model for USD260 (RM790) therefore if you can get at a lower price, you’ve got a very good deal. :-)

      I’m familiar with Desmond, one of the young sales assistants who works at the Mee Sing Watch store and its owner, Victor. This store never sells any fake watches of any brand, period. Furthermore, the SRP315K is too new in the market and no one has ever made a counterfeit version of this model yet. Buy with confidence. :-)


  47. Hi admin!

    Thank you very much!its actually lower than the price ever offered to me both online and retail.better grab it soon.
    Thanks again!


    I have a relatively small collection of Seiko 5 dress (?) watches, most of which are vintage and I thought – well, my wife did – that I was the only sad git who had any interest in them. I was curious about the ages of the watches, which I bought simply because I liked them, and they were quite cheap, so I googled Seiko 5s and discovered this site.

    Quartzimodo, the God of Seiko answered almost all my questions and uses apostrophes correctly too. Oh dear, maybe I AM a sad git !

    I think I’ve worked out that my oldest, a DX, is from 1975 and the newest, a 7s26b is from 2010.

    Can I post pictures (I use photobucket) ? The information from past posts has helped enormously. I have no interest in the actual value of my watches, I just love them (got all of them from E-bay, and 7 of them came from India) but I’d love to know if I’ve got the dates/origins right.

    • Hi Dani,

      Thanks so much for the compliments, glad to be of help. :-)

      You are indeed correct in saying that your Seiko DX was from 1975, because the DX series was primarily a 1970s range of affordable Seiko automatic watches. Sure, you can post links to your Photobucket, Picasa, Flickr, etc images of your timepieces, no problem.

      I would exercise caution when buying used Seiko watches from eBay sellers in India though. I’m not saying they’re cheats but I’ve seen quite a few examples of “Franken Seikos” for auction, i.e., Seiko watches cobbled together with parts salvaged from another different model. From my understanding, spare parts for vintage Seiko watches are hard to come by in India and it’s common to see a Seiko watch with a dial, hands and caseback from another model. It’s no big deal unless you’re a stickler for authenticity. :-)

      The 7s26B caliber had a rather short production run compared to the original 7s26A which was produced from 1996 to 2006. By late 2011 or early 2012, the 7s26B was superseded with the 7s26C caliber with minor design updates.


  49. Hello!
    I’ve been searchin for a while now, and I cant find any answers. My wife got a Seiko from her late grandmother, and wants to know when it’s from.
    On the backside it’s printed:
    In a circle around the plate: SGP BACK ST.STEEL 21-0062
    First horizontal line: SEIKO
    Second: the logo
    Third: 1 D 0 0 1 2
    Fourth : JAPAN – A

    We’d be grateful for any information.
    Thank you.

  50. Hi Quartzimodo, thank you for your reply.

    I am by no means a Seiko purist, just bought a few watches because I like the look and feel of them. I’ve had the backs off most of them and have yet to find a Franken Seiko (like it !), or at least the movement numbers match the backs, but it really wouldn’t matter. As long as they work, I’m happy.

    Will start with this one. (Hope I’ve got the right Photobucket link)

    November 1983 ?

    Many thanks, keep up the good work.

  51. Hi Quartzimodo.

    A question if you wouldn’t mind.

    Some of my watches could be from either of two different decades. Can I tell if the day and numbers are plastic or metal, without dismantling the watch ?


    • Hi Dani,

      Sure, no problem. Seiko used metal calendar discs for all of its automatic models until the introduction of the 7s26A caliber in 1996, which uses plastic day/date discs. Putting it simply, if your automatic watch isn’t part of the 7s-caliber family and was made before 1996, it’s metal. I’m not too sure about Seiko analog quartz watches as some calibers used plastic discs while others used aluminum. However, the black-on-white day-of-the-week inner disc that’s made of plastic seems to fluoresce under UV or black light while the date part doesn’t.


  52. Hi there i have a seiko watch that was my dads it is a 5 sport 7015-7010
    the serial number is 2D3570 it also has japan-l on the back case on the dial it has speed timer written in red i would like to know the year the watch was made and any other info thanks john

    • Hello John Fitzmaurice,

      Your watch was made by Seiko’s Daini factory in Japan on Dec 1972. The 7015-7010 is particularly a collectible watch and is hard to find in mint condition. The 7015 movement is a “flyback” chronograph which means the sweep second hand can be reset at anytime while it’s running. Conventional mechanical chronographs on the other hand, need to be stopped first before the stopwatch can be reset.

      The “Seiko 5 Sports Speedtimer” brand was exclusive to Japan, while Seiko watches bearing the text “Seiko Speedtimer” were for the worldwide export market. The 7015-7010 model carried an original price tag of 14,000 Japanese Yen and that translates to USD46 back in 1972, or USD252 today. This is a nice watch and I hope your watch’s reset mechanism is working perfectly to this day. :-)


  53. thank you for the information the watch is in perfect condition the strap needs some attention though. the watch lives in a draw and i bring it out from time to time to keep it ticking over.the info you gave me will be written down and put away with the watch.

  54. Hi there. I have a Seiko Quartz watch that was my Father’s: Model SGS050; Caliber H801-701M R 2; back: H801-7028 box A4; serial 460095. It’s analog, dark silver face, with a digital date/timer window in the 6 o’clock position. Unfortunately, when my Dad owned it, he had links removed to make it smaller, instead of using the adjustments on the bracelet. I’d like to know when it was made, what it’s value might be, and if it’s worth getting a new Seiko bracelet, or should I get a leather, generic replacement. Thank you for your help. Michael

    • Hi Michael,

      Your analog-digital, H801-7028 (SGS050P) was from the 1990s therefore it was made on June 1994. This model was assembled by the Seiko factory in Singapore. Is it worth replacing the bracelet? That depends whether the replacement bracelet can still be found and if the price is reasonable to you. Since this watch has regular lugs, you can easily use a leather strap in place of the original replacement bracelet. Try a brown or dark tan strap because brown and gold tones compliment one another nicely. :-)

      I found one example of an H801-7028 on eBay, which was won for only USD31. Note that because this was the only recent example on eBay, therefore it doesn’t reflect the indicative market price of this model. It so happens that it’s an auction and nobody outbid the winning bidder. I think your watch is worth more than that, but no more than USD150.


  55. Hi , My late father left me his seiko , it’s gold ( don’t know if its plated or not ) serial no is 661018 the other number on it Is 65397020D

    Can anyone give me any info on his watch and value ?


    • Hi Danny,

      Your dad’s watch (6539-7020) was made on June 1986. It’s very likely that the case is gold plated rather than made of solid gold, because Seiko made very few solid gold models while gold plated ones are quite common. If the caseback does NOT indicate the word “18K Gold” but rather “SGP” (or anything else), then it’s gold plated.

      There’s not much to tell about this particular watch, other than that it was one of the various inexpensive Seiko quartz dress watches from the 1980s with just a date display and no sweep second hand. The five-jewel, 6539 quartz movement runs up to 3 years on a Seiko/Maxell SR920SW or an Energizer #371 silver oxide cell. Unfortunately, quartz Seiko gent’s dress models don’t fetch a high price on the used market; generally no more than USD100 unless it’s made from solid gold. In this case, the value of the watch would be higher due to the metal used (gold) rather than the watch itself.


  56. Hello,

    I was given a gold tone seiko that has these numbers on the back, I’m not sure of where it came from but I was told it was purchased about 8 months ago although from what I am reading in your advice column above, it looks to be much older than that. The numbers I have on the back that seem to be of relevance are 410816 and 7430-5079 A0. Any information would be greatly appreciated!

    • Hi Levi,

      Your Seiko 7430-5079 is an export model meant for the USA. It’s a simple gent’s dress watch and there’s nothing really special about it in terms of historical significance and value. As a matter of fact, nearly all Seiko quartz dress watches fall into the non-collector’s category, except for the rare Seiko Lassale series.

      This watch was very likely to have been made on January 1984. It was fully Japan-assembled by Seiko’s (then) Daini factory. Its 2-jeweled movement requires a Seiko or Maxell TR721SW silver oxide cell.

      hope this helps,

  57. Hi,
    I just bought a supposely “brand new” Seiko SKZ211K from SkyWatches aka Watch Fashion Pte Singapore. Paid almost RM600 for it. It comes with a tag,guarantee card + box which makes me feel so assuring at first.
    However, when I reached home and examine it closely, I was totally disappointment with it conditions and quality. There were multiple scratch marks on the backcase. Closer examination of the dial, I found a smeared mark like some kind of ink droplets being hurriedly wiped off. Also found inside the dial is a strand of lint stuck between the inner rotating compass ring. The compass ring is also loose and can move side to side. Worse, both the crowns are loose and
    there are side to side slackness. In this condition, I am very doubtful of its water resistance capability even for washing hand over a tap.
    I really hope you can give me your this the way Seiko design it, is it normal for this model?? If not, can I claim from Thong Sia here?
    Serial No. 241255 Caliber. 7S36-01 EO
    Date of purchase: 17-11-2012

    • Hello Mike Thian,

      Sorry to hear that. If you’ve bought this watch online, take clear photos of your watch (use a digital camera with a macro mode) and submit them via email to Mr Adrian Low at for his attention. The compass ring is supposed to be loose but should not have too much free play sideways. The crown should also be fairly tight when screwed into the case.

      I suspect this could have been a watch that’s returned by a previous customer or one that could have been tampered with. There should not be any foreign objects like lint inside the dial if it’s straight from the factory. Your watch is fairly new; as a matter of fact it made on April 2012 from the serial number. It cannot be from 2002, because this model only appeared in 2005. Brand new watches should never have scratch marks on the caseback, unless it’s a new old stock piece, a factory reject or was simply mishandled.

      Since this watch was sold by a Singaporean dealer, Thong Sia Malaysia is likely not to honor the warranty although Thong Sia Singapore might – on condition that the warranty card has the seller’s stamp on it. I would however suggest that you contact Mr Low via email and follow up with a telephone call at (65)65351377.

      all the best,

  58. Appreciate and thank you so much for ur opinion n advice.
    Will follow-up on ur suggestion….and yes I do hv the warranty card with the dealer’s stamp.
    Thanks n best rgds,

    • Hi Mike,

      You’re welcome. Please update the status of your claim if you’ve managed to get the matter resolved. This is the first time I’ve heard something like this concerning Skywatches, because for years they have had a solid reputation and track record (based on discussions in various Seiko watch forums). :-)


  59. Thank you for your information, advice and insight into my Father’s watch. I like the idea of a dark brown or tan leather band to compliment the colors. Take care, and all the best. Michael

  60. Hello:

    Found your interesting site via Google searching “Seiko Sport 50 7N43-7B40″. The search results showed a page from 9/21/10 discussing the mfg. date of that or similar watch. I am confused after searching your comments, looking for that specific question and comment and not finding it. Not that it matters, but do you delete some archives?

    More important to me is information about the previously-owned Seiko Quartz watch (my 1st) I received today. It’s a Sports 50 7N43-7B40 followed by a box with “A4″ within. S/N 554001. Mov’t JAPAN 7N43-7C38 R 2 (indicated below “6 position” on dial).

    Please tell me what you can about this watch, but specifically, does (should) the bezel rotate? I assumed that it did rotate anti-clockwise, but on 1st attempt with only moderate force, it didn’t.

    Any additional info about mfg. date, orig. price, care and feeding etc. would be appreciated.

    My late father had a saying when describing someone he thought was lacking in intelligence. He’d say, “He didn’t know whether to sh_t or wind his watch…”

    Another favorite was, “The difference between humor and odor is, humor is a shift of wit…”

    Thank you in anticipation of your assistance.

    Happy Holidays,


    • Hello Kevin,

      Thank you for explaining your predicament in great detail. I had to do some looking up and found an example of a Seiko 7N43-7B40 here. The styling of this model is reminiscent of a Seiko watch from the 1990s, therefore I would say your Seiko Sports 50 was manufactured on May 1995 by the Seiko overseas factory in Singapore. The official reference model code for your watch is SGG450P.

      I’ve never seen this particular model before because Seiko made too many watch models for any single Seiko watch enthusiast to know them all. I think your watch’s bezel is fixed (non-rotating) as the bezel’s gentle curves are more towards aesthetics rather than for a good finger grip. If the bezel refuses to budge on applying brute force, it’s not meant to rotate. Some Seiko sports watches have fixed bezels, despite having the minute numerals engraved on the bezel. True Seiko diver’s watches on the other hand, have rotating bezels (except for all-digital readout diver’s watches like the Seiko NX-series diving computers.

      Since your watch is over 17 years old, if you plan to wear it as a daily “beater” have the rubber O-rings replaced at your next battery change and the movement lubricated by an experienced jeweler/watch repairer. Until you have all the rubber O-rings replaced, try not to immerse the watch in water – that means, no swimming in the pool with it. It’s a good idea to wipe the watch (and bracelet) with a soft cloth or a tissue paper, lightly soaked with a very mild soap solution after taking it off for bedtime. Window cleaning fluid also works well (provided your skin isn’t allergic to the ammonia solution) as it helps to bring out the shine from the watch’s bracelet and case. I got this idea years ago (using Windex glass cleaner) from observing a pair of sales assistants clean their shop’s watches on display.

      Make sure you wipe the back of the bracelet too, where it makes contact with your wrist. Human skin excretes sweat and grease, which invites bacteria growth. People who don’t take care of their daily worn watches tend to have watches that literally stink. Watch collectors have nickname for accumulated grime; we call it “wrist cheese” 😉

      On a final note, NEVER change the calendar date when the watch is showing a time between 9pm and 2am. The date mechanism can get damaged if you do so, resulting in costly repairs. If you have to adjust the calendar to the correct day and date, turn the main hands to 6 o’clock first (am or pm doesn’t matter), adjust the calender and reset the watch to the current time. With regards to the value of this model, it’s not much – generally no more than USD100.

      hope my reply is satisfactory,

  61. found watch is it any good silver w/blue face and diamonds/glass on band #’s on back 1N00-0KG0 AND 581496 also a box w/R2 in it movement Japan

  62. Aloha Sir , andstill thanks for your Journal of wisdom and help :
    I had a 7s26-0028 scored here,when I asked you about it you came really close to the information I needed. A fellow forumer help me out to pin point it to what actually I had rceived. ( ……. It turns out I have a (SKX173) in my hands, and did not know anything except what you advised me in, and that was very appreciated Sir. I was going to get rid of it, maybe a trade or swap, but now I am going to keep it. Thank you Sir for all the help and knowledge given to a ……Noobie?, in this area of High tech watchs I appreciate it greatly to know that I have found great help amoung others that are experiencing watch collecting and administrative advisor’s and people like yourself.
    Tahnk you very much ……….LongBike.

  63. Alohaagain Sir I forgo to give you the info of this watch to be sure it is a was said.
    Note : Moment Malaysia/ St.Steel/SEIKO 7S26-0028/ [A0] /
    Sc uba Diver’s / Ser. No. 570267 / crown is at 19 minutes
    / day/date is at 3:00 / it has english and spanish / Face Dial White lettering top/ (Red)Divers 200m / between 8:00 & 7:00 Mov’t / 7:00 & 6:00 Malaysia / second hand – round white dot /. When I put the two together they dont differ at all
    1- SKX173 and other well I did not know what it is, no papers or box .
    Dial is very nice and all lumes work greatly. They look identical side by side. Caliber is 7S26A inside. Guy said he thinks he got it year ….2000 or so.
    Tank you again Sir.

    • Hi LongBike,

      Thank you for giving me some vital, fresh information regarding the 7s26A. This the first time I’ve heard about an SKX173 diver’s watch bearing an early, Malaysia-made (7s26-0028) with the older 7s26A movement. Most examples of the SKX173 I’ve seen have the Singapore-made (7s26-0029) 7s26A movement, OR a Malaysia-made, 7s26B movement. From the serial number which you furnished, your SKX173 has to be from July 2005.

      If this is true, this now means that Seiko was using both their Singapore and Malaysia factories to manufacture the original 7s26A automatic movements. Personally I find to be rather odd, because Seiko usually assigns only one of its overseas production plants to assemble movements, not two. Perhaps a production overlap (or “parallel run”) did happen during that time, as Seiko Singapore’s factory totally ceased making the entire 7s-series movements by 2008. Since then, Seiko’s non-Japan made automatic movements are assembled by their Malaysia based plant.

      Don’t fret about it, as the movements from either factory are of the same quality. :-)

      Many thanks for your input,

  64. Aloha Sir and thank you for this information needed:
    The other SKX173 I have that I mentioned has this for a Serial Number:(910395). This I got intack in a box (ToTal Brand New one(pillow&Card), complete both books,no tag’s, price tag on box reads ($425.00).This one has a dial reading ….. (4:00(R2)5:00) 5:00(7S26-1127)6:00 /6:00(Malaysia)7:00 / 7:00(Mov’t)8:00 / Day/Date-3:00/Crown@19-minutes / Red-200m/ 7s26=0028 [A0]/SSteel …. Also a Flat Vent strap(B.New )
    w/Free NATO 3 ring Brn.Strap./// I have two more here need to ID’ed but will make another thread after this one. Thank you sir for your trusted information.

  65. Aloha again Sir:(Second sending) Seiko-6309-7290- A (SUWA mark)/[F1]/,all white letters: Water150mResist /3:00-Day/Date/6:00-6309-735MR /In Red-200m
    Next: Seiko-6309-729/[F1]/SUWA mark/,Pillow,Card,Istr.Booklet.
    Mov’t-6309A/Los Angeles, Calif.
    Sir the(Previous Watch asking before this one on the 6:00 reading it was also – 6309-735MR-suwa). Aloha and thank you again Sir for all this information.

  66. Hi,
    Remember..on 20 Nov.2012, I wrote about a faulty Seiko SKZ211k watch that I purchased from
    Well, I am glad to inform you that the matter has been settled.
    Today, I received the brand new replacement SKZ211K from Skywatches. I am very happy with the replacement piece as
    it is in a perfect condition.
    I must mention here that the Customer Service at Skywatches is amazing with prompt response to every inquiries
    that you may have.
    I also hv had a pleasant experience dealing with MR.Adrian
    Low of whose honesty and service goes beyond my expectation.

    hv a nice day and ciao


    • Hi Mike Thian,

      Glad to know that the matter has been resolved between and you. In some cases, an online seller appoints a third party drop shipper to send the item on their behalf upon receiving a purchase order.

      Since the product (in your case, the watch) is never actually seen by the original seller, the drop shipping merchant might sometimes send a defective item. Nevertheless it’s still the seller’s responsibility to rectify the situation.

      Mr Low has decades of experience in the watch sales business (so I’ve been told) and I don’t think he personally handled the original watch that you received. If he saw the condition of the Landshark that was about to be shipped, it wouldn’t have passed his quality standards. So now the matter is now between him and the party responsible for sending the first watch. :-)

      Thanks for the update,
      Q Admin

  67. Great site!

    What have I inherited? Silver dial marked Seiko Quartz 4004. At the 6 o’clock is Japan 4633-802L5 (S) Back: Water Resistant-G Stainless Steel 4633–8029 SN 6D1913.

    • Hi Art,

      My apologies for the delayed reply. The Seiko watch that you have is the iconic 4004 series, analog quartz model from the seventies. Early quartz Seiko watches have a bulbous, separate battery compartment that you can unscrew with the edge of a small coin without removing the caseback. Your Seiko SQ was made for the US market by Seiko’s Daini plant on December 1976. While the 4004 series models are a collectible, their second hand value varies from USD50 up to USD250, depending on the condition and styling.

      This is a nice watch and inherits the styling of Seiko’s automatic watches of the era. Its 2-jeweled movement needs an Energizer #301 1.5 volt, silver oxide cell with an operational life of less than 2 years.

      hope this helps,

  68. Hello Quartzomodo Sir,
    Have couple Seiko Diver watchs to Identify Please:
    I obtained these recently and needed to find what they are according to serial numbers so to know accordingly.
    1- Seiko Diver 6309-7290 ….. Ser.No. 4N1051
    2- Seiko Diver 6309-7290 ….. Ser.No 380855
    3- Seiko Diver SKX173 ….. Ser.No. 910396
    4- Seiko Diver 6309-7040 ….. Ser.No 360281

    Did some research but there is no website to follow up except your website of watch knowledge.
    Thank you very much Sir………… LongBike

    • Aloha LongBike,

      Here are the production dates of your watches:
      1- Seiko Diver 6309-7290 ….. Ser.No. 4N1051
      November 1984

      2- Seiko Diver 6309-7290 ….. Ser.No 380855
      August 1983

      3- Seiko Diver SKX173 ….. Ser.No. 910396
      January 2009

      4- Seiko Diver 6309-7040 ….. Ser.No 360281
      June 1983

      5- Seiko Diver SKX173………..Ser No. 570267
      July 2005

      I apologize for the late response.


  69. Hi My father has a seiko digital watch it has quartz lz on the frount the numbers on the back are 710560 and 0439-4009 water resistant, base metal top st. ase you able to tell us about this watch thanks

  70. I have SEIKO ladies gold plated watch with maroon color dial. On the back of the dial it is mentioned 064123, below to that 1100-1410 JAPAN-V.Please help me to find my watch history.

  71. Hi My father has a seiko digital watch it has quartz LC on the frount the numbers on the back are 710560 and 0439-4009 water resistant, base metal top st. ase you able to tell us about this watch thanks

    • Hi graeme,

      Your father’s old Seiko digital watch was made on January 1977, from the serial number that you provided. This is a model that was originally made and shipped to the USA. I found a good website that has a reference to your dad’s watch. Although the site says that the 0439-4009 was introduced on April 1977, their estimate may be slightly inaccurate.

      I highly doubt that this model had a production run for ten years; therefore it cannot be from January 1987. By the mid 1980s, Seiko had moved on to analog-digital watches and even their all-digital models had undergone styling changes. Digital watches are rarely produced for more than 3 years before their models are discontinued and replaced with more modern ones.

      cheers and apologies for the late reply,

  72. Hello sir,
    I have a golden Seiko 5 (7s26c)that I purchased not long ago. I sent it back to Seiko in N.J. to have the crystal replaced and in the process they scratched the case and replaced it. My question is I cannot locate a serial # anywhere on the back of this watch. The only #’s I have been able to locate are 7S26C stamped on the rotor and 7S26-0490 [AO] on the back cover and “movement singapore” WP and of course the large letters SEIKO. I cannot find the first sign of a straight line of characters or anything resembling a serial#. Am I not understanding something, or what am I missing here. Thanks in advance for your knowledge. You are providing a great service.

    • Hi Mike,

      I truly apologize for the delayed response. Here’s the reason why your watch was returned by Seiko USA’s service center with a new caseback but without the serial number. Serial numbers are unique to any Seiko watch of the same caliber and caseback code (in your case, the 7s26-0490). The serial numbers are laser etched or stamped at the assembly plant just prior to packing and shipping and correspond to the year, month and running unit number.

      When the caseback is changed, you get the exact caseback model – except that there will be no serial number. The most probable reason is because Seiko service centers are not equipped to etch or stamp serial numbers. The Seiko factory also does not issue replacement casebacks with pre-stamped serial numbers because they wouldn’t know in advance which watches will need a caseback replacement. Therefore it’s much easier for them to provide replacement casebacks without the original serial numbers on them.

      I’m pretty certain that your original caseback had “Mov’t Malaysia” stamped on it, because 7s26C movements are made in Malaysia. “Mov’t Singapore” applies to all 7s26A and early batches of 7s26B movements.

      hope this helps,

  73. First off this site is great and you are well informed on the Seiko brand awesome job, I a few years back working at a bar a customer had left their watch behind and after so long of it sitting in the lost and found we have a free for all for the employees. Everyone passed up this watch and so I ended up with it, it is stamped on the stainless back water resistant and the number is 5y23-8049. I have been trying to find out more info about it and all I have found was an E-Bay selling of one and it did not list much info about it other than its condition and calling it a vintage 1970’s Japan Quartz watch and was being sold for $80 + shipping. I would appreciate any additional info you may have about this watch cause I almost tossed it thinking that battery replacement wasn’t worth the cost vs. the watch value but not sure now.

    • Hi Stephen,

      Thanks for the comments and I am sorry for the delayed response.

      The Seiko 5Y23-8049 which you had found is a generic Seiko gents’ dress watch. There were two variants of this U.S. export model: the SCZ153P (silver) and the SCZ155P (black). The Seiko 5Y23 is NOT a watch from the 1970s, but from the 1990s. In your case, it was made in Singapore on June 1998.

      I did a quick check on eBay and found that the average selling price of used 5Y23 models is USD75. This is not considered a collectible Seiko watch and its average asking price reflects its low demand.


  74. more info to previous watch posting, under the water resistant its stamped 860565, and next to the 5y23-6049 it has
    A1 stamped inside a box shape

  75. Hi, I have a yellow gold seiko rainbow ladies watch the bach says seiko 320351 sgp back st. steel 11-0450 japan B any info will help..thanks need a new battery, not sure where to find

    • Hi Maritza Baez,

      Your Seiko 11-0450 is a hand-winding, mechanical ladies’ watch. It is NOT a quartz model, therefore it doesn’t run on batteries. You’ll have to wind the main crown until it feels tight and your watch should be ticking. If it doesn’t run at all then it needs to be repaired (probably a problem with the main spring or escapement).

      The date of manufacture is February 1973 and it was made at the Daini factory in Japan.

      hope this helps,

  76. Hi,
    I’ve been looking for some more info on my watch, on the back it has 7T42-6A6A 140085 JAPAN D 10 BAR. On the face at the bottom it has 7T42 6A7L T2 and SQ100 Quartz Chronograph Titanium. I think its a 1990’s watch.
    Seen info and pictures for other Sq100’s and 7T32’s but can’t find much about this particular movement/dial or 7T42’s.

    Any information appreciated.


    • Hi Andy,

      Your Seiko 7T42-6A6A carries the reference code SDX056J. The 7T42 caliber is very similar to the more common, 7T32 alarm-chronograph models; except that yours has a useful counter-clockwise, countdown timer. The reason it’s hard to find pics of Seiko 7T42s is because this caliber didn’t live a long market lifespan compared to the 7T32. In fact, I was able to amass only a handful of 7T42 pics from the Internet, while photos of 7T32 models are abundant.

      I think the 7T42 models were originally priced much higher than the 7T32 series watches and were discontinued early due too poor worldwide sales. It’s such a shame, because the 7T42 is a very interesting caliber. Perhaps in those days, consumers were much more price sensitive when it came to Seiko watches. :-)

      Your estimation of your watch’s production era is correct as both the 7T32 and 7T42 calibers debuted in the very early 1990s. Therefore your SQ100 was made on April 1991. As this is considered a collectible 7T-series Seiko watch, I hope you’ll keep it and pass the watch down to your descendants. :-)

      Apologies for the late reply,

    • Hi Dani,

      Apologies for the delayed reply. Your daughter’s Seiko 4206 was from February 1980. The 4206 caliber appeared about the same time as the date-only, 4205 and both have auxiliary hand winding.

      The 4206 caliber has long been discontinued and replaced by the improved 4207 caliber which is fitted to some currently sold, Seiko 5 ladies’ models.

      Hope this helps,

  77. Sir I have a ( 6309-7290 ) Diver that has this ser. No.4N1051 Like to find the year period it was made.

    Also a SKX173
    Ser No. 570267 Year of this too.

    Thank you very much Sir for your expertise on this Journal.

  78. Aloha and thank you very much Sir. Your reply is not considered late, but well waiting for because you have what many of us need for our knowings. Replies from you is a very worth while wait for all this information giving so freely.
    I am sure many would agree with me. Many of use would not know what to do beyond owning these watchs, and you have given us valuable information to what we have invested into. Again thank you for your expertise and knowledge in helping us through our time in ….. Horology.
    Aloha and Mahalo Sir ……… LongBike

  79. Hi,
    I have a Seiko 5 7009-3040 F nr 706078 and I’ve been looking for some information about it. I don’t really care how much it’s worth but I would like to know when was it made.
    It’s blue inside, has a Quartz inscription and has no day/date indicator.
    Thanks a lot,

    • Hi Vita,

      Something is definitely not right with your watch. The Seiko 7009 is a fully automatic watch movement with a day/date display, not a quartz one. What you have is a “Franken Seiko”, not an original Seiko watch. Either your watch is fitted with a 7009-3040 caseback (as the original one had been lost or damaged) or it’s a 7009 automatic with a non-original dial. Does your watch’s second hand rotate across the dial smoothly or does it tick once every second?


  80. Hi again,
    the watch was given to me by a friend and I thought it was fake Seiko as well but after examining it I discovered it has an original Seiko glass and caseback. It runs smoothly.
    Could it be a model made for the Asian market?


  81. I have a Seiko Mickey Mouse Kinetic Watch with date function. On the back are the following numbers:662472 and 3M22-OC59.
    It also reads WAter Resistant, Top Sapphire, Crystal St. Steel, Base Metal.
    Any ideas when this was made or if it is a collector item?

    • Hi G3js,

      Your Seiko Kinetic watch was very likely to have been made on June 1996. The 3M22 is a long discontinued Kinetic caliber and appeared in the early 1990s. Is this a collector’s item? Most probably not to Seiko watch collectors, but may be sought after by Disney cartoon character and Mickey Mouse memorabilia fans. :-)


  82. Hello
    was looking at you site and though i would ask….
    A Seiko sportsmatic 5 6619-8230 with waterproof on the back and seven digit no,7102536 what can you tell me about this
    Many thanks

  83. Hi and thanks for running this helpful site. I was hoping you might be able to tell me when my watch was made and what battery it takes. I removed the battery years ago and now can’t use it for reference.

    060462 is written between “water resistant” and Japan-M

    The other number listed is: 7123-5069 A

    Thanks again!

    • Hi Doug,

      Sorry for the belated response. I looked up your Seiko watch and managed to find some information about it. Your 7123-5069 requires a Seiko/Maxell SR1130SW or an Energizer #390 silver oxide battery. This movement has 2 jewels and should run for 5 years between battery changes. The 7123 caliber surfaced sometime towards the very late 70s and was used in a number of Seiko gent’s watches, including the rare Seiko 5 Quartz. Your watch is likely to be a U.S. export model and was made in Japan at the Daini factory.

      hope this helps,

  84. I am seeking information on a NOS women’s watch I own. It reads on the back: Seiko. Water resistant-6. Japan-A. Stainless Steel 2406-0050. 458561. The front bears a month window with both a numeral month and a japanese character. It has its original bracelet and also a sticker in the wrist band clasp picturing how to remove links, with info in japanese.

    • Hi Leslie,

      Great question. You have one the rare, almost forgotten Seiko “Joyful” models that were made for ladies in the seventies for the Japan market. It can also be worn by young teens and I’m almost certain that I once had a “Joyful” model in my very early teens as full sized, gents’ watches were too large for my wrist. :-)

      This 23-jeweled watch has auxiliary hand-winding operation to help fully wind the automatic movement quickly. It is also a high-beat movement (28,800 beats/hr) which makes it more slightly more accurate compared to the standard, 21,600 bph mechanical movement. Sadly, Seiko doesn’t make high beat movements for ladies’ models anymore since the company feels that the majority of their female customers prefer the convenience and the high accuracy of battery operated, quartz watches.

      The lightning-like, “Japanese character” on the dial isn’t actually a character, but a Seiko symbol that identifies that this watch was manufactured by its Daini factory back then (now known as Seiko Instruments Inc). AFAIK, all vintage Seiko ladies’ watches from the 70s and 80s came from the Daini plant (the other being the Suwa factory).

      Your timepiece was manufactured on May 1974, which now makes it almost 39 years old.

      Keep this watch, it’s a real gem. :-)

      best regards,

  85. Howdy, just seeking some info on a watch I came across recently.
    On the back reads as follows;

    2633-7000B(the be is in a square

    Any information would be greatly appreciated
    Look forward to hearing from you :)

  86. Hello Quartzimodo,

    Thank you for your site. I have attempted to date my Seiko Ladies watch from other websites with not succes.

    The #’s are 2517-0450 and 011862.

    It is a automatic with calender and waterproof. It has the symbol on the face at 6 o’clock and on the back.

    Thank you for any help.

    • Hi zabo,

      You happen to have a very rare and seldom seen Seiko 2517 automatic. There were two calibers that were made, the 2517A and 2517B versions with either 17 or 21 jewels.

      Some 2517 models were marketed under the Seiko Diamatic and Seiko-matic Lady Calendar ranges in the middle 1960s. Without doubt, your watch was from January 1970 and it was fully made in Japan by Seiko’s Daini factory. If you haven’t sent your watch for a full service for the past 42 years and intend to wear it regularly, I would recommend that you do so. An experienced watchmaker or repairer should be able to clean its movement thoroughly, re-lubricate its moving parts, change the rubber water-resistant gaskets and reset its accuracy.

      The lightning symbol on the face represents a Daini-made movement or watch. Ladies’ Seiko timepieces were exclusively made by the Daini plant (now known as Seiko Instruments Inc) back in its time.

      hope this answers your question,

  87. I just bought Series 5 SNKa28K1 Seiko. It appears to be genuine(probably gray market). Is it any good? I also own two older Seiko watches. One is a Bell-Matic no.350603 and a 23 jewel LM stainless-steel automatic with the no. 330355. Will you kindly date them? Tank You.

  88. Hi, I Love your site……A1!!!!!!!!!!!+

    I hope you can help with the folowing watch details:
    SEIKO 5 GOLD “900648” KY 7S26-0060 A4 (info. on back/front/inside)

    I have used your site info, with many thanks; Through this, I have also been able to determine the age of this watch accordingly.SEIKO 5 AUTOMATIC DAY/DATE WR 3BAR.

    I make it @ oct.2007 manufactured. Please correct me if wrong?
    my main question is the other sequence of numbers, Re:KY 7S26-0060 A4; I have no idea what these interpret to in full.

    My final question is whether this is Brass OR Gold plated metal?

    I hope that you will be able to tell me.

    I look forward to your reply as soon as convenient.

    Thanks once again for your very informative site It is BRILLIANT!!!!

    Kindest regards to You & All, Brian.

    • Hi Brian,

      I just got to replying to your post in my blog today. The Seiko 5 7s26-0060 appears to be an early model if I’m not mistaken. You didn’t say if your watch has a see-thru caseback or a solid stainless steel one. If it’s a transparent glass display back, then your watch would be from October 2009. If it has a stainless steel back it would be from October 1999. Seiko switched from solid caseback to the glass display type sometime between 2003 to 2004.

      No idea what “KY” means, but “A4″ refers to the standard Seiko issued caseback tool for the case.

      Your watch is gold plated. Seiko uses five types of materials for its watches:
      1. Solid 18-carat gold
      2. Gold plated, stainless steel base
      3. Stainless steel
      4. Titanium alloy
      5. Resin/plastic (usually all digital sports models)

      There has never been brass made watches from Seiko that I know of.

      hope this helps,

  89. Further to previous quest.. This is Twenty-One Jewels 7S26…Markings inside.

    Oh, ABSOLUTELY TERRIFIC SITE….. In case I forgot to mention. ;))

    All the Best, Brian.

  90. Congratulations on a fantastic site.

    I have found an old Seiko – self winding, stainless steel chronograph – in one of the drawers that was given to me as a birthday present, I believe in the 70’s. It has a number 280774. From reading your articles I am assuming it was manufactured in 1972 August? It had stopped working but miraculously appears to be doing so again. I am based in the UK and wondered whether to and if so where to have it serviced. The original strap broke so a replacement was fitted some years ago – non Seiko. I assume I wouldn’t be able to purchase an original. However, any suggestions would be very helpful. Thanks again for the site.

  91. Pingback: Seiko 7T32-6A50: The outsider - Clarkson, blog! | Clarkson, blog!

  92. Hi. I’m eyeing on a vintage Seiko watch: Cailber 5626-5000 / 391733. Is it worth collecting? How much is a reasonable price?

    Many thanks
    Seiko Enthus

  93. Quartzimodo:

    I find this site to be extremely interesting, informative, and professional.

    I have worn my Seiko Quartz for over 30 years, replaced the batteries on 3 occasions until this year. It has had 2 batteries replaced within 3 months and has now stopped again. My question(s) is multi-faceted beginning with where and when my Seiko Quartz was made, and what battery is needed to properly keep it running. Also, is there a reputable Seiko watch repair in the Seattle-Tacoma area that you might recommend? In addition, is there any collectable value with this particular watch? The identifiable features written on the face of the watch are:
    (in tiny print at the face bottom)Japan 7123 81SLR or 815LR
    Written on the back bezel:
    Water Resistant
    Stainless Steel 7123-8149G

    It still has its SQ Stainless Steel Multi-Linked bracelet. Can you please help me with the information I have provided?

    Thanking you in advance,
    Richard Williams

  94. Aloha Quartzimodo Sir, I recently got a ….. ( Seiko 6309-7040 Turtle watch and would need the serial numbers I dentified please. (.. 6309-7040-Seiko 150 Diver )Ser. No. 382722 . Thank you very much for your expertise and time Sir, and a much appreciated website.

  95. Quartzimodo:

    In reference to my post on 3/26/13 @ 4:21PM, I forgot to mention that my 7123-8149G has a white face and is a day/date. I tried to follow your opening disclaimer regarding answering posts about dating. However, after reading 56 months worth of inquiries/threads I find no mention of my particular timepiece so I naturally had/have to ask anyway. I really do hope I am not SOL.

    Once again, thanking you in advance,

    • Hi Richard Williams,

      My apologies for overlooking your original post, sir. Two weeks ago I was away on vacation to Borneo and the broadband connection was extremely poor and was too slow to load my blog’s administrative dashboard. If you’re unable to find any references to “Seiko 7123″ in the previous comments, it’s because no one else has posted a question relating to this caliber. :-)

      In any case, I’ve located your questions from your earlier post:

      1. Where and when my Seiko Quartz was made?
      Early Seiko quartz watches were always Japan made and 7123-based models were assembled by Seiko’s Daini factory. Your particular watch was a US export model that’s made for the North American market. It was made on March 1979.

      2. What battery is needed to properly keep it running?
      That would be a Seiko AB-AU or Maxell SR1130SW silver oxide cell. The run-time life between battery changes is 5 years, according to Seiko. If your battery consumption is unusually high, it’s probably a case of dried out lubricating oils on your watch’s geartrain that forces the stepping motor to use more power to overcome friction between the moving parts.

      3. Is there a reputable Seiko watch repair in the Seattle-Tacoma area that you might recommend?
      I live on the other side of the world (SE Asia) and wouldn’t know, sorry. But you could look for a watch repair shop that is experienced with servicing old Seiko quartz watches in your area, or send your watch to Mahwah, New Jersey where the Seiko USA’s service center (Coserv) is.

      4. Is there any collectable value with this particular watch?
      It depends. Seiko used the 7123 quartz movement in assorted watches, including the short lived Seiko 5 Quartz. The collectible status of an old quartz Seiko watch depends on its styling. Collectors tend to favor sporty looking ones, such as these ones compared to ordinary gents’ dress types. And as such, the resale price depends on public demand. Have a look at some various Seiko 7123 watches here with different stylings.

      hope this helps and sorry for the late response,

  96. Hi ,thanks for all the information.I recently purchased Seiko SNKE 03 automatic and started to admire Seiko watches.Now I am planning for a second watch.Can you please suggest me a nice one with power reserve indicator which I find a useful function and cost less than USD 400.00.Thank you very much

  97. Aloha again Sir, Forgot to mention it……….. I bought from a guy at the local stadium swap meet for ……..( Ten Bucks )and one for parts with it. It has a original Seiko 22mm type oyster bracelet on it, all original, except the dial was changed. The parts one also is all original.
    ( I guess I was in the Right place, Right time )

  98. Aloha Sir , I have another one that you replied to but need the Date also. Seiko 6309-7040 Ser.No. 382722 mentioned above. Sir these Seiko watchs com up in Hawaii quite often and many dont take care of them so they become items to get hold off real easy. Tourist are constant buyers and they dump many things that come availabe to many. Thank you again very much for your time and expertise Sir.

    • Hi Longbike,

      Since you’re into collecting 6309-704x divers, you might want to consider modifying one of them with a custom dial and hands! I own two and one of them has a non-original Seiko made dial, therefore I modded it using Yobokies’ custom dials. The other one has an original Suwa dial in very good condition, therefore I leave it as it is. :-)

      BTW, your 6309-7040 is an international version and was made on August 1983. This is assuming that the caseback is original to the watch, not a swapped caseback from a different watch. If the caseback says “JAPAN A”, your dial should have the fine print “JAPAN 6309″ below the 6 o’clock marker.

      It’s not unusual to find lots of vintage Seiko watches outside of Japan; countries like Peru, the Philippines and Hawaii USA would have plenty of them due to the Japanese tourist population post World War 2. :-)


  99. Aloha Sir , Thank you very much for your reply on my 7040.
    I look into modding watchsb ut cant get the looks of many, maybe in time. I like most orinality of alot of things, so when watchs became, I liked to keep them original for a time. Yobokies have and do great work, and quality is experiste. Many people here loose their jewelry in the rushing time they spend here and leave and just replace it later and leave it at that. People here just find them and sell them for the …. $$$$ Buck. Also the military is here and they buy and sell alot so sources are available most commonly. I Have the 6306-7001,in fact two of them got it free but in parts, so I am going to get it back to an original state soon. Problem is the original Dials are not common to find. All I need is one original dial and I would be just fine.
    Thank you again and Aloha from Hawaii Sir.

  100. I just bought a 1983 SEIKO 7n43 -812L D2 serial #391361 case # 7n43-8119.
    It does not have SEIKO on the case nor the bracelet but the dial has SEIKO with QUARTZ underneath it. It is a very nice looking and working watch but without the SEIKO on the back or the bracelet I’m wondering if it’s a genuine SEIKO or not.
    Can you enlighten me?
    Thanks Ed

    • Hi Ed Anderson,

      I apologize for taking a long time to get back to you due to some personal issues. :-(

      It took me also some time trying to find more information about your particular model and I finally found this example on the Internet. This is a discontinued, Japan made model that was specifically marketed to the USA. The 7N43-8119’s caseback for some odd reason, doesn’t have the “SEIKO” inscription but its bracelet clasp should have the “SEIKO” logo embossed on it. If you bought it used, the clasp may have been replaced with a generic one at some point in time.

      Assuming that your watch looks like the one in the link which posted, yours should be a genuine Seiko watch.

      hope this helps and sorry for the delayed response,

  101. <<>>

    Thank you QM. I failed to mention that it was a 21 jewel model. Do I need to insure the watch at a reasonable price?

    I also have a men’s watch that has me confused because of the numbers:

    On the back: 7123-7040 [G],8D0733, Japan-G

    ON the front: 7123-705LR. it has the lightning symbol with SQ above it.

    The calender is odd because it has a dual system. One is the normal date and day…the other is a Roman numeral for each day and the normal date.

    I am guessing this is rather generic 1988 model. But, the 7123 has me locked up.

    I also have a 5Y23-7218 that I am sure is a generic SQ.

    Thank you for all you do. This is a fun site to read.

    • Hi Zabo,

      Do you need to insure the watch at all? If you ask me, you could insure it if you want to – but only for its sentimental value rather than its face value on the second hand market. You could even include the watch as part of your all-risks home insurance (if you have one) but home insurance generally give low compensation payouts. Unless you happen to own a rare vintage Rolex or Omega, old Seiko watches are usually not worth insuring – unless you have dozens of really collectible and valuable Seiko watches.

      Your 7123-7040 is a quartz model and likely to have been made on December 1978 since the 7123 caliber was introduced in the late 1970s. The lightning symbol means that your watch was assembled by the Daini factory in Japan (the other one being the Suwa plant).

      As for the dual-language day display, the Roman day-of-week is an alternative language for owners who aren’t versed in English. It’s easier to for such owners to count the number of days in a week; therefore Monday is represented by “I”, Tuesday (II), Wednesday (III), Thursday (IV), Friday (V), Saturday (VI) while Sunday is signified as a solid red rectangle. Some old Seiko models have Kanji characters, German, French, Italian, Farsi, Arabic etc (depending on the market) and if you aren’t fluent in such languages, the Roman display mode is easier understood.


  102. Hi, i have a Seiko divers, which i bought new in the late 70’s. Ive date aged it from the various websites and its manufacture date is december 78. its model number is 7548 700A. It still works fine and in pretty reasonable condition with just a few minor marks. Do you know what a typical cost would be to have it refurbished, and would it be worth doing as i have no idea what the value of this watcch would be. Thanks

    • Hi Paul Fewster,

      You are correct; the 7548-700A was one of Seiko’s earliest quartz divers’ models from the late 70s. While it is a collectible diver’s model it will not necessarily fetch a huge price on eBay or the second hand market.

      The cost of refurbishing your watch will depend on how much work needs to be done to it and the fees charged by professional watch restorers. Contact Jack Alexyon and Bob Thayer for an estimate. Seiko is not in the business of restoring watches to their original glory, therefore unless repair is the issue at hand, don’t bother contacting a Seiko service center. :-)


  103. Hello Sir, i came across a seiko 5 21 jewel watch at a yard sale and was trying to price it,#981523 above japan E. I also have a seiko watch that i have had for over 35 years and would like to know some history on it as well. I find two sets of numbers on it Japan 4100-5069 on face and 740549 on back.
    Thank you.

    • Hi Abe,

      Your Seiko Quartz 4100-5069 was a late 70’s dress timepiece and is most probably dated April 1977. It’s fully made in Japan by Seiko’s Suwa factory for the US market. Seiko must have made numerous models based on the 4100 movement but there aren’t many photos of Seiko 4100s available. Unfortunately most Seiko dress watches fall into the generic category and there’s not much history behind them, unless it’s a quartz Grand Seiko or the historical Astron, which was Seiko’s first commercially produced quartz watch.

      As for your first question, Seiko 5 (the non-chronograph kind) don’t carry much value in the used market. You didn’t furnish the caliber/caseback numbers, therefore I wouldn’t know what model you bought at the yard sale. :-)


  104. I’m using seiko watch for the moment, at the bottom are these numbers 7009 – 8760 F. Another number is 384147 M.I wanted to know more about it.Can you help me please?

    • Hello Wais,

      Apologies for the belated reply. Your Seiko 7009-8760 is a sporty looking, Seiko 5 that used the 7009 movement from Seiko Japan’s Daini factory. Judging from its styling, it appears that this is a late 1980s model and I believe your watch was made on August 1993, three years before the replacement 7s26A caliber was introduced. It was most likely assembled by Seiko’s factory in Hong Kong. The 7009 is a fully automatic, 17 jewel movement with no hack/auxiliary hand winding feature. There’s nothing really special about the movement itself.

      I’m sorry I can’t give any further information beyond that. Seiko made lots of models based on the 7009 automatic back then and it’s virtually impossible to track each and every one of them.


  105. Excuse me! I forgot to say about my watch.My watch is automatic seiko 5.I wonder that which date is produced.Thanks…

  106. Hi! Very informative article! I wanted to date my Seiko Watch, but when I click on the Link for Jayhawk’s Production Date Calculated or the Production Date Calculator, all I get is “Web page unavailable” for both links!

    Anyway, my Ex-Husband gave me this watch, for Christmas, one year (while we were still married) and I can’t remember what year it was…The Serial number is 9N0413 and I think the Calibration number is 5N09…There are some other numbers before those numbers, separated by a dash…They are Y150…Not sure if those mean anything or not!

    Hopefully you can tell me a li’l about my Watch…I’m thinking I might sell it, although I still wear it, sometimes!

    Thank you for your help! Enjoyed the information you gave on figuring out the Production Date for Seiko Watches! :o}


    • Hello Kat,

      Jayhawk, who wrote the script for his Production Date Calculator originally hosted his webpage on his university’s web servers. His webpage often migrated from one server to another and as such, links have to be updated every time he makes changes. His latest version has some improvements over the previous one but he needs volunteers to verify the starting year of many calibers that’s not in his database. Thanks for notifying me, as I’ve located and updated the calculator’s latest web address. :-)

      You have a quartz ladies’ Seiko watch – the Y150-5N09. This is an old caliber dating to most probably the early 1980s, when the Seiko Holdings company was still known as “K. Hattori Seiko Co.” in Japan. I have no idea how long the company continued making the Y150 movement, but I managed to locate some photos of your watch online. From the braided bracelet and faux diamond studded bezel styling, my best guess is that your watch was manufactured on November 1989, if not 1999.

      Unfortunately Seiko ladies’ watches don’t carry much of a resale value unless they’re made of 18 or 24 carat solid gold. If it says “ST. STEEL + BASE METAL” on the caseback, then your watch is just gold plated and is therefore not valuable. If you ask me, it’s better to keep it for sentimental reasons unless you absolutely don’t want it to remind you of your former hubby. 😉


  107. Aloha Sir: Have ( 2 )Divers Seiko 6309-7040’s
    serial number is : …………. 780637
    serial number is : …………. 360062
    Got them at a good price.
    Thank you for your time sir.
    Aloha LongBike

    • Hi LongBike,

      Wow, more 6309-7040s! Are you sure you’re collecting these divers and not reselling them? 😉

      First watch: August 1977. This one is definitely Japan made.
      Second watch: June 1983. If you don’t see “JAPAN A” on the caseback, it’s likely to be Hong Kong assembled.


  108. Aloha Sir and thank you for your information , and it is very welcome to receive.
    Have another one:
    I forgot to add one that is a ……. ( 6309-7049 )
    Case Back reads = ( ” Japan A” ). Serial. No. 151594.
    ( This one has an original Hong Kong” , Dial in it and Running great, and all original case also. ( I found this one ) Sir thank you very much for your time and expertise.
    Aloha and Mahalo from Honolulu.

    • Aloha LongBike,

      I’m amazed that you’ve managed to find all the available 6309 divers in Honolulu – and that’s probably just only on the Oahu island. :-)

      In any case, your latest one would be from May 1981 and it’s a US market model (designated -7049 instead of -7040). I’m a bit surprised that this one is Hong Kong assembled though, because I’ve never heard of a non-Japan made 6309 diver as early as 1981. Guess there’s always the first time to everything.

      Q. Admin.

  109. Thank you again Sir for the information. Sir get this about the 7040 Diver. I found this one in …….
    ( Sixty Foot of Water, on a sand and coral area. It was almost completely buried with sand when I saw it about ( 20 feet away from me. It was kinda tarnished but not faded or the watch leaking. It was in a little mossey shape outside of it, and when I shook it it started up and ticking just fine. And its still going now, been running for about a month and a half so far.

    • Hi LongBike,

      Actually that’s a good idea to snorkel dive into the shallow waters looking for “buried treasure”. More likely than not diver’s watches that are found on the seabed were fitted with rubber straps. The original owners may have accidentally dropped them while adjusting their watches strapped on their wet suits, the rubber straps simply failed and broke or intentionally cut if their watches somehow got tangled onto something underwater. :-)

      Since the 6309 were considered cheap to replace (unlike a Rolex Submariner), I guess their owners who lost them didn’t want to go through the trouble to find their watches. I remember reading an article about someone finding a vintage Citizen 70’s automatic diver washed up on the shore – although the dial and hands had badly corroded the watch was still ticking! :-)


  110. Hi Quartzimodo,

    Thank you for the information! Quite informative…I have a feeling that he gave me the Watch between 1989 and 1998…The reason I think he gave it to me between those years is ’cause we took a Caribbean Cruise, for Christmas in 1998, and I had the Watch then.

    Just out of curiosity, I wanted to see how much this style of Watch might be selling for, so I looked on several different Auction/Sell Now Sites…They’re selling from anywhere between $56.78 to $145.00. It’s amazing how something that is not real gold, but just either Gold Filled or Gold Plated and doesn’t even have real Diamonds could cost as much as it did, when he gave it to me. At the time, I believe it went for around $225.00…(He accidentally left the Price sticker on the Box, so that’s how I know where he bought it and what he paid for it, when he gave it to me. I never let him know that he did, though)

    Anyway, thank you, again for the information…It’s good to have this, so that if I ever do decide to sell it, I can put it in the description! :o}

    Kat :o}

  111. Aloha Sir and Thanks again. Well I just got ( 3 ) more 7040’s and (2 ) 7290 free but 2 are apart the guy gave up on them trying to learn how too’s. So here I go again Sir. Thanks and Mahalo Nui Loa for your time.

  112. Wow that was unusual. I just wrote an incredibly long comment but after I clicked submit my comment didn’t appear. Grrrr… well I’m not writing all that over again. Anyway, just wanted to say fantastic blog!

  113. Hi,

    Great info.

    I inherited a Seiko watch from my father a few years ago, I remember him wearing it as a child ( I am now 60!) and I have tried to date it from your information but it does’nt seem to adhere to your criteria so I wonder whether you could help.
    The numbers on the stainless steel back are: SGP – 66-9990 – 6302188, it has a pearlised face with no numerals and printed on the face diashock 17 jewels.

    Many thanks,


    • Hi Ron,

      Good question. The reason that you were unable to date your father’s Seiko watch is because it was made before 1968. Most, if not all Seiko timepieces up to 1967 had seven digit serial numbers but the method of finding the date of production is still the same as those bearing 6-digit serial numbers. From ’68 onwards to this day, Seiko adheres to its 6-digit numbering convention.

      In your case, you have a manual winding (non automatic) Seiko watch from March, 1966. Seiko made two variants of this caliber back then – the Cal 66A and 66B, with the latter appearing on the Seiko Sportsman series of watches. Both have an identical jewel count of 17 and are considered “low beat” mechanisms, ticking at 18,000 beats per hour (or 5 ticks per second). The industry norm for mechanical watches today is 21,600 beats per hour (or 6 ticks/second) or higher, for improved accuracy.

      Although the Cal 66 watches are interesting timepieces, they are generally not considered high value collectibles. If you suspect the watch hasn’t been serviced for the past 47 years, have it inspected by a watchmaker competent with mechanical watches. At the very least it may need a lubrication service and a re-calibration (or regulation) to restore its accuracy.

      good luck! :-)

  114. Hi Quartzimodo,can you tell me something about Seiko 5 with this numbers on the back: 6309 – 7150 a2.Serial number is 193743.On the frontplate says JAPAN MVT i cased HONG KONG.

    Thank you

  115. Aloha again Sir , Another 6309-7040 Diver.

    Aloha Sir, yes another score 7040. This one is in very good shape yet. ( Say…95% ). ( Serial No.382722 ) . Had a good deal so I took it ….. He said $ 25.00,I said … $50.00. Original box, Papers, Original Starp, Super Oyster Bracelet-never used, (Package Deal Sir). Elderly Gentleman said cant wind it up, crown stuck, I explained, Sir, it wont wind up,Crown is stuck, I said it unscrew’s Sir,He said have two others smaller, this one is to big and clumbsy too. I decided, I will continue to keep collecting them now that they come around.
    Aloha and Mahalo again Sir.

  116. Hello,

    Like Don, I inherited a 66 caliber Seiko watch. Thanks to you, I now know that it was produced in October 1967. But here’s the thing, I know that all the watches that came after it have six digit serial numbers and sometime before it they had seven digit serial numbers. The serial number for this watch is 705433. From my research I know the caliber is a 6660 because it is a non-auto, no date, 21 jewel watch. The interesting thing about this watch is that it is a 14k solid gold case, bezel, mesh bracelet and clasp Men’s watch. The markings on the back of the case are: Seiko 14k 66 1001 705433. However, the Seiko 14k and 66 1 look slightly different than the rest. In other words, the serial number and 001 look original and the rest appear to be added later because they are not perfectly aligned.

    My father purchased this watch while he was in Tokyo in the late 1960’s. He told me it was a one-of-a-kind Seiko. Other knowledgable Seiko collectors have suggested it is probably a custom made Seiko, and this was before I mentioned that I was told that it is one-of-a-kind.

    My question is this. Is it possible that Seiko made a commemorative watch to signify a change? Is this truly a one-of-a-kind Seiko? If it is, why? What’s the reason?

    And lastly, should I wear it or vault it?

    Thanks and best regards,


    • Hi Bob,

      I’m afraid I don’t know much about the 66-1001, let alone whether yours was truly a commemorative model. From the pictures of your watch which I found here, there isn’t much detail to begin with. The bracelet appears original to this watch, from the 18ct solid gold markings on the inside of the buckle. As far as I know, commemorative Seiko watches should have identifying markings either on the dial and/or caseback to signify the event.

      For example, the legendary and extremely rare, 5718-8000 chronograph “Tokyo Olympics” had the Olympic torch logo etched on the caseback and all of them had 7-digit serial numbers beginning with “4” to denote the year 1964, when the games were held. Your dad’s watch could have been a rare custom made Seiko which very few people know about. The museum curators at the Seiko Horology Institute in Tokyo might be able to shed some light on your watch.

      Out of curiosity, why is your watch up for sale on eBay when you’re unsure whether you want to wear or store it? Unless you need the money for something urgent, in my opinion a fine example of a Seiko like this should be kept within the family to be passed on to your future generations. :-)

      best regards,

  117. Hello Quartzimodo,

    Thank you for your reply.

    I’m afraid I missed an opportunity to find out more about this watch while my father was alive. I think my response was something like “Cool” when he told me it was one-of-a-kind. But now that it’s mine, I want to know more about it. Since I am quite ignorant about Seiko and its history, I turned to those whom I felt could get me up to speed the quickest. I feel that time is of the essence not only for me but also to find out more about this watch for future generations before all the dinosaurs that could have helped become extinct.

    A knowledgeable collector suggested I put it up for sale on eBay at a ridiculous price inorder to draw out serious collectors who may know more about it. So, that’s what I did. Instead of putting a price on it, I put in up for auction with a ridiculous reserve. No one came close :)

    Sometimes it is better to work backwards to try to find out things, i.e. what it is not. What you mentioned leads me to conclude that it is not a commemorative watch. It makes sense that it would most likely have additional info on it if it were. I didn’t know about the Seiko Horology Institute in Tokyo, but I will contact them to see if they know something more.

    I’m becoming more convinced that it is a custom made Seiko. Made for someone or some reason and my father happened to be in the right place at the right time.

    Thanks again for your help and insight.

    Best regards,


    • Hi Bob,

      Putting your dad’s watch on eBay with a high reserve price is one way to see whether the fish will bite. 😉 If there’s anyone on the watch forums who may be able to shed some clues on your dad’s gold Seiko timepiece would be Kohei Saito, a vintage Seiko collector/fanatic on the TimeZone forum. His personal collection alone is in the hundreds and he’s known for collecting several pieces of the same model. 😉

      I’m not sure if he’s still active on the TimeZone forum but if he isn’t there may be other people just as knowledgeable as he is (fingers crossed). You might want to register as a new forum member (read their forum rules carefully) and post your question there, complete with photos (but not images linked to your eBay auction) to aid the veteran members there.

      Do note that even moneyed Seiko collectors will scope their hunt to vintage Seiko watches that they’re already familiar with, e.g. King Seiko, Grand Seiko, Laurel, Presmatic and of course, the extremely rare chronographs and diver’s watches from yesteryear. The old 66-1001 may mean a lot to your dad, but then again it doesn’t necessarily imply that vintage Seiko collectors will share his enthusiasm. :-)

      best regards,

  118. Hello Quartzimodo, I have two Seiko matches, neither of which are running right now. My question is are they worth spending money on? No.1 is a rectangular face (19×22 mm), 9020 5399 RD in box , S/N 4D6006.
    No2 is a round face in gold, 5Y23 – 8119 RD in box, S/N 250268.
    Thank you for considering this request. Jim.

    • Hi Jim Beat,

      Are your watches worth repairing and restoring? Well, it depends whether the necessary components that need replacing can be obtained in the first place. Quartz watches, especially from decades ago are more difficult to repair compared to vintage mechanical Seiko watches. Any watch repairman with good experience with mechanical movements can usually perform repairs and adjustments, unless the movement design has too many complications, e.g. automatic chronographs.

      Quartz watches spell a different story. In many cases, the Seiko service center will replace the entire quartz movement rather than attempting to fix individual components like stepping motors or even the electronic circuitry. It’s like say, the main circuit board in your laptop or tablet. If one vital component goes bad and renders the laptop useless, nobody undertakes repairs on the motherboard. It’s simply replaced with a new one.

      That said, your first qualifier is whether Seiko Japan still carries a replacement movement or whether you can find a working, donor watch with the same movement (Caliber 9020 and 5Y23) on eBay. If you’re able to source a replacement movement, your next criterion would be the labor fees to fix your watches. This depends on your budget and whether they are of sentimental value to you. Good luck with the repairs! :-)

      hope this helps,

  119. Having trouble identifying a variant of the Seiko 7s26-0020
    It is JDM but the hands have black outline and I have not been able to find JDM with black outline.
    similar variants are SKX399K
    SKX401K (Pepsi variant of the SKX399K) neither of them are JDM
    Picture of watch in question.


    Uploaded with [URL=][/URL]

    • Hi Stephen,

      Actually there’s no such thing as a JDM 7s26-0020 diver’s watch. In fact, the 7s26-0020 divers are not meant to be officially sold in Japan but for export only. The SKX399K and 401K on the other hand, are special models that were made specially for the Philippine market. JDM Seiko watches are always marked “JAPAN” on the dial and never “MADE IN JAPAN”.

      best regards,

  120. Hi Quartzimodo,

    I was wondering if you could tell me anything about two Seiko Watches I got, for doing someone a favour, on eBay.

    The first one is Silver, in colour, with a Mesh type Band and a Ruby coloured face…It says: Seiko…190179…Base Metal Top…Stainless Steel Back…11-34 09, on the back. This is a wind-up Watch…It doesn’t work and I wanted to know about it and if it’s worth spending Money, to get it fixed?

    The second one is a Seiko Quartz…Gold, in colour…Says: Seiko…Base Metal Top…St. Steel Back…930567…1400-5219 R…Japan, on the back of it…This one works.

    Anything you can tell me about these Watches would be great!

    Thank you,

    Kat :o}

    • Hi Kat,

      Good to hear from you again. :-)

      The first watch – the 11-3409 ladies’ model was made on Sept 1971. This particular model is most likely an export version for the US market. The Caliber 11A ladies watches, assembled by Seiko’s Daini production plant was quite popular in its time and many Cal 11A models had very attractive, feminine designs. Some had artificial diamonds on the bezel as ornaments with most fitted with proprietary decorative bracelets that were unique to the design. Unlike Seiko gents’ models, should the bracelets break it’s virtually impossible to fit substitute watch bands.

      Is the watch worth fixing? That depends on your motives. If you intend to wear it I’d say it’s worth the cost of overhauling/repair if the watchmaker’s fees are not too prohibitive. If you intend to sell the watch, you’ll have to add the cost of the repairs to your profit margin and hope someone will bite. Remember that unlike men, women tend to favor brand new watches than wearing someone else’s relic from the past. 😉

      As for the other quartz watch, the Seiko 1400-5219 is also a US domestic market model. I don’t know how it looks like, but you can find the text “JAPAN” on the dial (near the 6 o’clock marker) then it’s likely to be from March 1979.

      hope this helps,

  121. Hello Quartzimodo,

    Well, my quest continues! I’m starting to think that if I hadn’t broken my silence, no one would ever know about this watch. I didn’t know I maybe the only one left. WOW, that is rare. Everyone could be gone that knew about it and records could be lost, BUT the proof is in the pudding and fortunately, I’ve got the pudding.

    I tried to contact the Seiko Museum as you suggested but couldn’t find their email addy. So, I addressed an email to them but sent it to their parent (Seiko Watch). I’m not sure if the Museum ever received it but I did get a reply from Seiko stating they were sorry they couldn’t identify it but the caliber was produced in the late 1960’s. That was it. Not much help there. If you happen to have a direct email addy for the Museum, I would be grateful and will try again.

    From my continuing Seiko education, I’ve learned my watch was produced by Suwa Seikosha. Back in the day, Suwa was very innovative. They were the first to produce the Grand Seiko, Quartz Astron, the Spring-Drive and basically made Seiko Men’s watches while the Daini division made Women’s watches. I have also learned that Suwa and Seiko Watch are separate companies today. AND Suwa has their own private museum. My next step is to try to contact Suwa and to look into the Time Zone forum.

    Through it all, I’m getting a great Seiko education and I’ve spotted a few I might just like to own:)

    Thanks again,


    • Hi Bob,

      The Seiko Institute of Horology (a.k.a. the Seiko Museum) unfortunately has no email contact address although they have a fax number. The museum requires visitors to book their visit in advance and doesn’t allow the public to enter the premises as and when they like. However, some lucky folks who made the pilgrimage to the Seiko Museum have been kind enough to share their experience through watch forum threads such as this one. :-)

      As you probably are aware as a centuries old, traditional homogenous society, few Japanese can speak and write excellent English. Even if you’re able to communicate with the museum curators, they might have trouble understanding your questions – let alone drafting a reply in English that makes sense to you. :-)

      Also bear in mind that the museum curators are not necessarily walking Seiko historians themselves; they may just “work there”. At most they may be able to refer you to some resident Seiko expert living in Japan who might know more about your dad’s watch than the Seiko company does. For example, if your Seiko watch was one of the nondescript gold 66-1001s that were sold to a third party and later customized (e.g. monogrammed) as gifts to corporate individuals, Seiko may not have a clue about it. As far as they’re concerned, it’s a Caliber 66 Seiko timepiece.

      Unfortunately Seiko didn’t safeguard their archives and records properly. Years ago I remember reading an article recounting a fire that broke out in their headquarters (not the famous 1932 Tokyo Earthquake) sometime in the 1970s or 1980s which destroyed almost all of their prized documents. What’s unknown is whether the destroyed records included catalogs and documents of the countless models that they’ve produced in the past. Seiko made many more models than Rolex ever did. The more notable and milestone watches are proudly displayed at the Seiko Museum. What about the other countless Seiko watches that were considered “generic” models? It’s impossible for Seiko to keep a copy of each and every model that they’ve ever sold and they all won’t physically fit into their museum building for sure.

      The reason that you can easily buy a comprehensive book on Rolex vintage watches is because the Swiss manufacturer didn’t make watches as diverse as Seiko did, plus the fact that old Rolex watches are much more valuable and sought after vs a comparable Seiko counterpart. Now you know why Seiko’s website only advertises only some of their contemporary models and don’t have an archives section for all of their long discontinued models. :-)

      It’s good to know that you’ve done some research on the history of the K. Hattori company that started out manufacturing Seikosha watches and clocks. While it’s true that women’s (and boys) Seiko watches were made only by the Daini factory, Daini also made movements for men’s watches, e.g. the rare 701x chronographs, the 7002 and 7009 to name a few. Most collectors agree that overall, Suwa made better designed movements and watches than Daini did.

      Keep me posted when you’ve found a solid lead on your dad’s watch. :-)


  122. Hi Quartzimodo,

    Thank you for the information! I really like the 11-3409 and since I got it, as Gift, along with the other Watch (the 1400-5219) for doing a favour, for someone on eBay, I think I’ll try to get it fixed, so I can wear it! :o}

    I’m confused about something, though…The other Watch (the 1400-5219) says JAPAN 1400-0290R on the Face, down by the 6:00 marker…Why are the 2 numbers different? I used my Jewellers Loupe to read it, since it was so small, to be able to read, with the naked eye! So, why the different numbers? Thank you for the information!

    Kat :o}

    • Hi Kat,

      Well good for you! There are not many women that I’ve heard who appreciate pre-owned vintage watches, unless it’s a part of their family heirloom or estate :-)

      The good thing about mechanical watches is that they’re not proprietary designs to the original manufacturer. AFAIK, Seiko’s service centers don’t undertake overhaul or repair jobs of their mechanical watches as it’s a time consuming task and requires a skill set that’s beyond merely replacing movements. You can think of it like stripping down the engine block of a classic car and painstakingly restoring every component. In terms of labor, it’s cheaper and much easier to drop in a used motor of the same model that still works.

      Quartz watches are a different story as the quartz movement (or module) has little or no serviceable parts. More often than not a non-working quartz watch will need its entire movement replaced – and if the model has been discontinued for over a decade, you’ll have to find a donor watch with the same but working module.

      The reason why the numbers on the dial usually differ from the caseback is simple. “1400-0290R” refers to the exact dial that your watch has. Seiko made several variations of the 1400-5219 and the only way to distingu