Seiko serial numbers
Sminto is not affiliated with, endorsed by or an authorised service of Seiko. This page does not authenticate watches.
The serial gives the month and the last digit of the year; the decade comes from the calibre and case code beside it.
Where to find the serial
Six characters engraved on the caseback, usually beside the calibre and case code. Seven digits on watches made before 1966.
Where to find the reference
The calibre and case code are engraved on the caseback beside the serial, as two groups joined by a hyphen (7S26-0020): the first is the calibre, the second the case.
What this page can and cannot say
It reads the serial against the format rules Seiko has used and says which era it fits. The serial gives the month and the last digit of the year; the decade comes from the calibre and case code beside it. With a reference it says whether the serial's era and the reference's production window fit each other.
It does not say whether a watch is real or fake, it does not ask the brand anything, and no lost-or-stolen check is performed here. Years are estimates from published tables that the brand does not publish or endorse; where tables disagree, the page shows both.
No reviewed table for Seiko yet, so the check does not run for this brand. Rows go live only with a source and a reviewer; the Seiko serial number table shows what is live.
Lost or stolen?
No lost-or-stolen check was performed on this page. Check free at Enquirus, or at The Watch Register (paid; used by dealers, insurers and police).