The Seiko SNKP21 is a mechanical automatic watch with movement-case reference 7S26-04R0. 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. | SNKP21 Depending on the region, bracelet model and other features you may find this watch reference written as SNKP21J, SNKP21J1, SNKP21J2, SNKP21K, SNKP21K1, SNKP21K2, SNKP21P, SNKP21P1, SNKP21P2, etc. |
| Case-movement ref. | 7S26-04R0 |
| Case-Dial code | 04R-12G |
| Caliber | 7S26 |
| Type | mechanical automatic |
| Jewels | 21 |
| Power reserve | 41 hours |
| Hand-winding | no |
| Stop seconds hand | no |
| Crystal | hardlex |
| Strap/Bracelet ref. | M0VD221J0 |