The Seiko SKZ231 is a mechanical automatic watch with movement-case reference 7S36-02K0. 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. | SKZ231 Depending on the region, bracelet model and other features you may find this watch reference written as SKZ231J, SKZ231J1, SKZ231J2, SKZ231K, SKZ231K1, SKZ231K2, SKZ231P, SKZ231P1, SKZ231P2, etc. |
| Case-movement ref. | 7S36-02K0 |
| Case-Dial code | 02K-03H |
| Caliber | 7S36 |
| Type | mechanical automatic |
| Jewels | 23 |
| Power reserve | 41 hours |
| Hand-winding | no |
| Stop seconds hand | no |
| Crystal | |
| Strap/Bracelet ref. | 3371MG |
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