Seiko 7S55 Movement Details
Seiko caliber 7S55 is an automatic watch movement. Production was in the 2000s.
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| Sub-brands: | Seiko 5, Superior |
| Power reserve: | 41 hours |
| Accuracy: | +45/-35 seconds/day |
| Day / date? | Date only |
| GMT / world time? | No |
| Chronograph? | No |
| Hacking? | No |
| Rate: | 21,600 bph |
| Number of jewels: | 23 |
| Lift angle: | 53º |
| Size / diameter: | 27.0mm |
| Height: | 4.9mm |
| Balance wheel code: | 310020, 310197 |
| Mainspring code: | 201024 |
| Screw codes: | 012123 (stud screw), 012168, 012354, 012420, 012539 (second reduction wheel screw), 012919 (ratchet wheel screw), 016705 |
| Notes: | Same as cal. 7S35 but with decorative "Tokyo Stripes" rotor and higher grade finish, for use in the Seiko 5 Superior range with display backs. |
| PDF guides: | Technical guide : 7S25A, 7S35A & 7S55A |
| Related movements: | 7S25 7S26 7S35 7S36 |
Articles
- The 5 Forgotten Seiko Movements [romeoswatches.com]