The Seiko SKXK87 is a mechanical automatic watch with movement-case reference 7S26-2040. 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. | SKXK87 Depending on the region, bracelet model and other features you may find this watch reference written as SKXK87J, SKXK87J1, SKXK87J2, SKXK87K, SKXK87K1, SKXK87K2, SKXK87P, SKXK87P1, SKXK87P2, etc. |
| Case-movement ref. | 7S26-2040 |
| Case-Dial code | 204-503 |
| Caliber | 7S26 |
| Type | mechanical automatic |
| Jewels | 21 |
| Power reserve | 41 hours |
| Hand-winding | no |
| Stop seconds hand | no |
| Crystal | hardlex |
| Strap/Bracelet ref. | Z1397S |