Seiko Watch Production Date Calculator is ALIVE again - Seiko & Citizen Watch Forum Japanese Watch Reviews, Discussion & Trading
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Old 03-18-2013, 05:17 PM   #1 (permalink)
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Default Seiko Watch Production Date Calculator is ALIVE again

Hi Gang,

I spent a few hours rewriting my old code for the Seiko Watch Production Date Calculator, and I think it is slightly better than the original. You just have to type in your movement number, the serial number, and my program will print out the production month and year.

Here is the new link: http://www.csce.uark.edu/~jgauch/photos/seiko/

The list of start years for Seiko movements is in need of updating, so I will need your collective help in bringing the program up to date. My plan is to add a similar CGI that will let SCWF members upload serial numbers and purchase decades for watches that are NOT in my list, and then crunch the numbers to get start dates for movements not on my list.

Cheers,
John
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Old 03-18-2013, 05:17 PM   #2 (permalink)
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Old 03-18-2013, 05:22 PM   #3 (permalink)
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Default Re: Seiko Watch Production Date Calculator is ALIVE again

Many thanks for all your time and work on this invaluable resource!
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Old 03-18-2013, 05:23 PM   #4 (permalink)
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Thanks very much!! +1
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Old 03-18-2013, 05:24 PM   #5 (permalink)
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+1 for your efforts.
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Old 03-18-2013, 05:27 PM   #6 (permalink)
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Default Re: Seiko Watch Production Date Calculator is ALIVE again



Thank you! +1
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Old 03-18-2013, 05:34 PM   #7 (permalink)
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Thank you!
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Old 03-18-2013, 06:48 PM   #8 (permalink)
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Default Re: Seiko Watch Production Date Calculator is ALIVE again

6R15 were introduced from November 2005.
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Old 03-18-2013, 07:50 PM   #9 (permalink)
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Default Re: Seiko Watch Production Date Calculator is ALIVE again

Quote:
Originally Posted by 7s26b
6R15 were introduced from November 2005.
Great! I will add that start date to the calculator.
John
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Old 03-18-2013, 08:40 PM   #10 (permalink)
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Default Re: Seiko Watch Production Date Calculator is ALIVE again

Thanks, John.
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Old 03-19-2013, 02:46 PM   #11 (permalink)
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Thank you John Karma action sent your way
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Old 03-20-2013, 05:03 PM   #12 (permalink)
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AWESOME! Now I have something that will work with my iPad/iPhone online!!
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Old 03-20-2013, 09:51 PM   #13 (permalink)
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Old 03-30-2013, 06:57 PM   #14 (permalink)
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Old 03-31-2013, 03:27 PM   #15 (permalink)
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Default Re: Seiko Watch Production Date Calculator is ALIVE again

Hi John,


This is great news, many thanks from The Netherlands!!!


If you like, I pm you the numbers of my last 2 purchases.


Regards,


Aad
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Old 04-01-2013, 10:24 AM   #16 (permalink)
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Default Re: Seiko Watch Production Date Calculator is ALIVE again

Quote:
Originally Posted by jgauch


The list of start years for Seiko movements is in need of updating, so I will need your collective help in bringing the program up to date. My plan is to add a similar CGI that will let SCWF members upload serial numbers and purchase decades for watches that are NOT in my list, and then crunch the numbers to get start dates for movements not on my list.

Cheers,
John

Hi John, I believe that the 4R16 Auto movement was introduced in 2008.


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Old 04-01-2013, 02:16 PM   #17 (permalink)
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Good to see it back and running!
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Old 04-09-2013, 11:05 PM   #18 (permalink)
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Default Re: Seiko Watch Production Date Calculator is ALIVE again

Well done and thank you i wish i could give you 100 points for your effort
Regards
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Old 04-09-2013, 11:13 PM   #19 (permalink)
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Default Re: Seiko Watch Production Date Calculator is ALIVE again

Hi, I am informed by the seller that the 6309-7049 I purchased, with serial number 680394, dates production to Aug. 1986.

When I punch the serial number into the calculator with any decade selected I get August 1976.

Doing my homework shows that the 7049 was produced from 1976 - 1988 so that means it is either one of the first or last but I seriously doubt that it is nearly 40 years old and rather expect that it is a very late example.

I am not sure what this information may mean from the perspective of the serial number database/calculator but I hope it helps - or points out something that someone can tell me about my watch that clears up the confusion.
Obviously no criticism of the calculator but rather an observation and question about the history of my watch.
Best regards,
Will
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Old 05-09-2013, 08:02 PM   #20 (permalink)
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Quote:
Originally Posted by stardotstar
Hi, I am informed by the seller that the 6309-7049 I purchased, with serial number 680394, dates production to Aug. 1986.

When I punch the serial number into the calculator with any decade selected I get August 1976.

Doing my homework shows that the 7049 was produced from 1976 - 1988 so that means it is either one of the first or last but I seriously doubt that it is nearly 40 years old and rather expect that it is a very late example.

I am not sure what this information may mean from the perspective of the serial number database/calculator but I hope it helps - or points out something that someone can tell me about my watch that clears up the confusion.
Obviously no criticism of the calculator but rather an observation and question about the history of my watch.
Best regards,
Will
Your movement the 6309 may be one of Seiko&#039;s "long life" movements. Most are used for less than 10 years, but a few are used for longer. My production date calculator simply starts at the first year produced, and counts up until the last digit of the year matches the first digit of the serial number. Hence, I will always guess the early date for movements used for more than 10 years.

The only reason I have not fixed this is because getting the "end date" for Seiko movements is even harder than getting the start dates
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Old 05-09-2013, 08:03 PM   #21 (permalink)
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Quote:
Originally Posted by KevG

Hi John, I believe that the 4R16 Auto movement was introduced in 2008.


Kevin.
Thank, I will add that info to the DB in my next edit.
John
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Old 05-09-2013, 11:54 PM   #22 (permalink)
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Default Seiko Watch Production Date Calculator is ALIVE again

I&#039;ve missed the calculator! Thanks for bringing it back.
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Old 05-10-2013, 02:55 AM   #23 (permalink)
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Default Re: Seiko Watch Production Date Calculator is ALIVE again

Having learned that the first 2 digits of a serial No. are the year & month you can work out quickly the watches age but is there any list for model life span because as a newby to Seiko this quick check only works if you know the decade the model is from. i.e. until I get more familiar with the styles I could be 10 years out.
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Old 05-10-2013, 10:32 AM   #24 (permalink)
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Quote:
Originally Posted by skg7548
Having learned that the first 2 digits of a serial No. are the year & month you can work out quickly the watches age but is there any list for model life span because as a newby to Seiko this quick check only works if you know the decade the model is from. i.e. until I get more familiar with the styles I could be 10 years out.
There is very little info on which movements are in use for more than 10 years, so even the experts have trouble with this one. The only one I know of personally that was used for more than 10 years is the 7s26 movement that Seiko recently replaced with the 4R series. Unless I get more accurate info, I can&#039;t do much to improve the calculator
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Old 05-10-2013, 01:19 PM   #25 (permalink)
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Default Re: Seiko Watch Production Date Calculator is ALIVE again

Sorry I didn&#039;t mean the movement, I meant the case type (that&#039;s how new I am to this, I can&#039;t name a watch from it&#039;s appearance yet, or more importantly, age it). Also the note you make about the 1976 or 1986 watch shows if a style ran for more that 10yrs the problem would be more difficult to solve
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