The Seiko SKX139 is a mechanical automatic watch with movement-case reference 7S26-0080. 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. | SKX139 Depending on the region, bracelet model and other features you may find this watch reference written as SKX139J, SKX139J1, SKX139J2, SKX139K, SKX139K1, SKX139K2, SKX139P, SKX139P1, SKX139P2, etc. |
| Case-movement ref. | 7S26-0080 |
| Case-Dial code | 008-117 |
| Caliber | 7S26 |
| Type | mechanical automatic |
| Jewels | 21 |
| Power reserve | 41 hours |
| Hand-winding | no |
| Stop seconds hand | no |
| Crystal | hardlex |
| Strap/Bracelet ref. | 44Q9JG |
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Case reference: 7S26-0080
Case-Dial code: 008-117
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SKX140
Case reference: 7S26-0080
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SKX142
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SKX144
Case reference: 7S26-0080
Case-Dial code: 008-117
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Movement: 7S26
Jewels: 21
Power reserve: 41 hours