Seiko 6106-7510

Seiko Seiko 5 / Sportsmatic / Actus, calibre 6106. What it is, how to date it, how to check it's original, and what it's worth.

The Seiko 6106-7510 is a Seiko Seiko 5 / Sportsmatic / Actus. It runs on Seiko's calibre 6106, an automatic movement with 17 or 21 or 25 jewels. It can't be wound with the crown and winds itself as you wear it. Seiko made the 6106 from about 1967 to 1976.

How old is it? The first digit of the serial number on the caseback is the last digit of the year, the second is the month (1–9, then O, N, D). On a 6106, made 1967–1976, a serial starting 25 means May 1972. Our Seiko Identifier works it out for you.

Is it original? The small dial code at 6 o'clock should start with 6106, like the caseback. If it starts with another number, the dial was made for a different model (a replacement dial). We have seen this reference with dial code 6106-7660.

Specifications

Have a 6106-7510? Check yours in seconds: open the Seiko Identifier with 6106-7510 filled in.

Questions

Can I wind a Seiko 6106-7510 by hand?

No. The 6106 winds itself as you wear it. To start it, move the watch gently from side to side for 20–30 seconds.

How do I set the day and date on a Seiko 6106-7510?

Most 6106 watches either change the day when you press the crown, or have a quickset when you pull the crown out one click. Never change the date between 9 pm and 1 am. Step by step: crowatches.com/seiko-set-day-date.html

How old is my Seiko 6106-7510?

Read the serial on the caseback: the first digit is the last digit of the year, the second the month. The 6106 was made about 1967–1976, which fixes the decade.