The Seiko SNKF57 is a mechanical automatic watch with movement-case reference 7S26-03D0. It houses the 7S26 caliber with 21 jewels, running at 21600 bph with an accuracy of +45/-35 seconds per day. It has a 41 hours power reserve, no hand-winding and no stop seconds hand function.
| Ref. | SNKF57 Depending on the region, bracelet model and other features you may find this watch reference written as SNKF57J, SNKF57J1, SNKF57J2, SNKF57K, SNKF57K1, SNKF57K2, SNKF57P, SNKF57P1, SNKF57P2, etc. |
| Case-movement ref. | 7S26-03D0 |
| Case-Dial code | 03D-09K |
| Caliber | 7S26 |
| Type | mechanical automatic |
| Jewels | 21 |
| Power reserve | 41 hours |
| Hand-winding | no |
| Stop seconds hand | no |
| Crystal | hardlex |
| Strap/Bracelet ref. | 3387JB |
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