The Seiko SKZ331 is a mechanical automatic watch with movement-case reference 7S36-05D0. It houses the 7S36 caliber with 23 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. | SKZ331 Depending on the region, bracelet model and other features you may find this watch reference written as SKZ331J, SKZ331J1, SKZ331J2, SKZ331K, SKZ331K1, SKZ331K2, SKZ331P, SKZ331P1, SKZ331P2, etc. |
| Case-movement ref. | 7S36-05D0 |
| Case-Dial code | 05D-06V |
| Caliber | 7S36 |
| Type | mechanical automatic |
| Jewels | 23 |
| Power reserve | 41 hours |
| Hand-winding | no |
| Stop seconds hand | no |
| Crystal | |
| Strap/Bracelet ref. | M0JT112J0 |