The Seiko SKXM15 is a mechanical automatic watch with movement-case reference 7S26-3120. 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. | SKXM15 Depending on the region, bracelet model and other features you may find this watch reference written as SKXM15J, SKXM15J1, SKXM15J2, SKXM15K, SKXM15K1, SKXM15K2, SKXM15P, SKXM15P1, SKXM15P2, etc. |
| Case-movement ref. | 7S26-3120 |
| Case-Dial code | 312-033 |
| Caliber | 7S26 |
| Type | mechanical automatic |
| Jewels | 21 |
| Power reserve | 41 hours |
| Hand-winding | no |
| Stop seconds hand | no |
| Crystal | hardlex |
| Strap/Bracelet ref. | Z1358S |
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SKXL31
Case reference: 7S26-3120
Case-Dial code: 312-033
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Jewels: 21
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SKXL33
Case reference: 7S26-3120
Case-Dial code: 312-033
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SKXL35
Case reference: 7S26-3120
Case-Dial code: 312-033
Type: Mechanical Automatic
Movement: 7S26
Jewels: 21
Power reserve: 41 hours