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- Omega Cal. 620 - Third wheel 1240

| Brand | Omega |
|---|---|
| Calibre | Ω 620 |
| International reference | 1240 |
| Compatibility | 625-630-635 |
| State | Never used |
| Year of production | 1960 - 1973 |
| Caliber diameter | 17.50 mm |
| Caliber height | 2.5 mm |
| Frequency | 19'800 A/h |
| Lift | 48° |
| Power reserve | 42h |
| Ruby | 17 |