The Seiko SKZ257 is a mechanical automatic watch with movement-case reference 7S36-02X0. 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. | SKZ257 Depending on the region, bracelet model and other features you may find this watch reference written as SKZ257J, SKZ257J1, SKZ257J2, SKZ257K, SKZ257K1, SKZ257K2, SKZ257P, SKZ257P1, SKZ257P2, etc. |
| Case-movement ref. | 7S36-02X0 |
| Case-Dial code | 02X-04B |
| Caliber | 7S36 |
| Type | mechanical automatic |
| Jewels | 23 |
| Power reserve | 41 hours |
| Hand-winding | no |
| Stop seconds hand | no |
| Crystal | |
| Strap/Bracelet ref. | 3319JG |
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