Dating seiko watches calculator
Nor does the clone of it on SCWF: Excel (download) version by 'Cannop' does: ?
Dating Vintage Seiko, Citizen Watches is not as difficult as you may think, as all the information you need is inscribed on the back case.
Some digging will reveal that the 7S26 was introduced in mid-year and not available in January.
Just by accident found the "old" seiko production date calculator. This file was lost on the internet for the past 2 years. but if you try using it, you'll find it doesn't work !
Dating Vintage Citizen watches can prove a little more challenging but in theory at least they are also as easy to date.
In the picture above we have a Vintage Seiko Bellmatic with the back-case removed, inscribed on the back-case is all the information needed, Stainless Steel is the watch case & back material, the 4006-5002 is the Model number, Water Resistant is self-explanatory, Japan is country of Origin (Made in) and 213067 is the serial number, the first two digits are the year and month, so you do need to know the decade, this comes with experience, or you can just Google the model number and you should find the decade quite quickly, or you could ask if it is still unclear, I will do my best to help.
You will also be given a link to check its value and if available useful links such as to manuals etc (I am currently adding these to the database).I hope this helps, it is not always as straightforward with dating vintage Citizens, as the case-back information changed over the decades.All Seiko's should have a Serial number on the case back The first number in the Serial is the last number in the year of production, and so if it is a new watch and you see an 8 it should be the year 2008 The second number in the Serial is the month the watch was made if you see a 4 it will be the month of April most Seiko serial are 6 digits long and so a serial of 86XXXX would be a watch made in April of 2008 The key to the whole trick is knowing what movement is in side and older movement like the 6309 was made in the late 70's and 80's and so a watch with 86XXXX would be April 1988 and so on ...My 6138-8040 is a 6N, I'm pretty sure it was neither produced in 19. Enter the serial number and movement from your seiko watch in the boxes below.