Seiko 7S Family
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 |