Seiko 7S Family

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Seiko 7S Family

The following movements were all based on the Seiko 7S26 movement.

Group Year
Introduced
Movements Mainspring Hacking/
Hand-winding
7S 1996 7S25, 7S26, 7S35, 7S36, 7S55 Traditional No
6R1x 2006 6R15, 6R20, 6R21, 6R24 Spron 510 Yes
4R1x 2008 4R15, 4R16 Spron 510 No
4R3x 2011 4R35, 4R36, 4R37, 4R38, 4R39, 4R71 Traditional Yes