The Seiko SNX120 is a mechanical automatic watch with movement-case reference 7S26-0440. 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. | SNX120 Depending on the region, bracelet model and other features you may find this watch reference written as SNX120J, SNX120J1, SNX120J2, SNX120K, SNX120K1, SNX120K2, SNX120P, SNX120P1, SNX120P2, etc. |
| Case-movement ref. | 7S26-0440 |
| Case-Dial code | 044-121 |
| Caliber | 7S26 |
| Type | mechanical automatic |
| Jewels | 21 |
| Power reserve | 41 hours |
| Hand-winding | no |
| Stop seconds hand | no |
| Crystal | hardlex |
| Strap/Bracelet ref. | 44Q6KB |
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Case-Dial code: 044-114
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Case reference: 7S26-0440
Case-Dial code: 044-114
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SNX115
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Case-Dial code: 044-114
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Case-Dial code: 044-114
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SNX118
Case reference: 7S26-0440
Case-Dial code: 044-114
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Movement: 7S26
Jewels: 21
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SNX121
Case reference: 7S26-0440
Case-Dial code: 044-115
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Movement: 7S26
Jewels: 21
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SNX123
Case reference: 7S26-0440
Case-Dial code: 044-115
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Movement: 7S26
Jewels: 21
Power reserve: 41 hours

SNX124
Case reference: 7S26-0440
Case-Dial code: 044-115
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Movement: 7S26
Jewels: 21
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SNX551
Case reference: 7S26-0440
Case-Dial code: 044-114
Type: Mechanical Automatic
Movement: 7S26
Jewels: 21
Power reserve: 41 hours