Tools
CloseWhat year is my Grand Seiko?
Pick the brand. Type the number. We’ll tell you when it was most likely made.
Seiko’s year-and-month code, made with extra patience.
How well the number tells the year
ClearlyYear and month, mostly. Add the calibre, like 9S65, and we can name the decade.
Where to look
- The serial is on the case back.
- The calibre and case code, like 9S65-00A0, are on the case back too.
Ask the maker
Grand Seiko doesn’t offer a public archive. The date on the warranty card is the best record.
Questions
Where is the serial number on Grand Seiko watches?
The serial is on the case back. The calibre and case code, like 9S65-00A0, are on the case back too.
Can the serial number tell me when my Grand Seiko was made?
Year and month, mostly. Add the calibre, like 9S65, and we can name the decade. Seiko’s year-and-month code, made with extra patience.
Does Grand Seiko keep official records of its watches?
Grand Seiko doesn’t offer a public archive. The date on the warranty card is the best record.
Does a matching serial number prove my Grand 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.