Note: This serial number format does not apply to the new Seiko Five Sports models. There are some errors on this site but in general it is quite reliable. A comprehensive date calculator can be found here - SEIKO - Serial Number to Manufacturer Date Decoder. You just enter your watch serial number and caliber number and the date will be calculated. If you want to confirm the production date on a specific model there are a number of online calculators available.
Seiko serial number serial numbers#
While most of the seven digit serial numbers followed the Year, Month, Production # format there are some examples that seem to follow a Month, Year and Production # format. This seven digit serial number continued until 1969, so there is a transition period where some models had a six digit serial and other models a seven digit. Previous to this Seiko used a seven digit serial number with a similar format. The six digit serial numbers are found on Seiko models beginning from 1966. Other clues to the model decade can be the watch styling or branding, for example Seiko Advan models are associated with the 1970’s. For movements that were produced for a long period of time they often go through various revisions and are marked with a version letter like A, B, C etc at the end of the general calibre e.g. This can be determined by the calibre number, as most movements were not produced for longer than a decade. Exactly how this production number was allocated between models and production runs is not clear.Īs the year is only comprised of the single digit, to determine the relevant decade the model is from you need to know the period that the watch was released. This indicates the example was manufactured in May 1976 and the unique production number is 2290. For example on this case number of 7005-8062 the serial number is 652290.
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