Tools
CloseWhat year is my Seiko?
Pick the brand. Type the number. We’ll tell you when it was most likely made.
The first digit is the year. The second is the month. The decade is up to us.
How well the number tells the year
ClearlyClear for year and month. Add the calibre, like 7S26, and we can name the decade.
Where to look
- The serial is on the case back, usually six digits.
- The calibre and case code, like 7S26-0020, are on the case back too.
Ask the maker
Seiko doesn’t offer a public archive. The serial itself is the best record.
Questions
Where is the serial number on Seiko watches?
The serial is on the case back, usually six digits. The calibre and case code, like 7S26-0020, are on the case back too.
Can the serial number tell me when my Seiko was made?
Clear for year and month. Add the calibre, like 7S26, and we can name the decade. The first digit is the year. The second is the month. The decade is up to us.
Does Seiko keep official records of its watches?
Seiko doesn’t offer a public archive. The serial itself is the best record.
Does a matching serial number prove my Seiko is genuine?
No. Real serial numbers are copied onto fakes, so a number that looks right proves nothing on its own. This lookup only estimates when a watch was made. For a proper opinion on authenticity, have the watch inspected with the case back open.
Every answer here is approximate and given to the best of our knowledge, from charts published by dealers and collectors. Watchmakers rarely publish their own.
A correct number doesn’t prove a watch is genuine. For a proper opinion on your watch, bring it in for an inspection, or read how to tell if a watch is genuine.
What you type stays on your device. Nothing is sent to us or anyone else. Please don’t post your full serial number online.
Last checked against the published charts on 5 November 2026.