The Seiko SNKF51 is a mechanical automatic watch with movement-case reference 7S26-03C0. 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. | SNKF51 Depending on the region, bracelet model and other features you may find this watch reference written as SNKF51J, SNKF51J1, SNKF51J2, SNKF51K, SNKF51K1, SNKF51K2, SNKF51P, SNKF51P1, SNKF51P2, etc. |
| Case-movement ref. | 7S26-03C0 |
| Case-Dial code | 03C-09J |
| Caliber | 7S26 |
| Type | mechanical automatic |
| Jewels | 21 |
| Power reserve | 41 hours |
| Hand-winding | no |
| Stop seconds hand | no |
| Crystal | hardlex |
| Strap/Bracelet ref. | 3387AB |
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SNKF54
Case reference: 7S26-03C0
Case-Dial code: 03C-09J
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Power reserve: 41 hours