The Seiko SKX399 is a mechanical automatic watch with movement-case reference 7S26-0020. 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. | SKX399 Depending on the region, bracelet model and other features you may find this watch reference written as SKX399J, SKX399J1, SKX399J2, SKX399K, SKX399K1, SKX399K2, SKX399P, SKX399P1, SKX399P2, etc. |
| Case-movement ref. | 7S26-0020 |
| Case-Dial code | 002-161 |
| Caliber | 7S26 |
| Type | mechanical automatic |
| Jewels | 21 |
| Power reserve | 41 hours |
| Hand-winding | no |
| Stop seconds hand | no |
| Crystal | hardlex |
| Strap/Bracelet ref. | 4FY8JZ |
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