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- Omega Cal. 601 - Screw for crown wheel core 2109

| Brand | Omega |
|---|---|
| Calibre | Ω 601 |
| International reference | 2109 |
| Compatibility | 600-602-610-611-613 |
| State | Never used |
| Year of production | 1962 - 1970 |
| Caliber diameter | 27.90 mm |
| Caliber height | 3.35 mm |
| Frequency | 19'800 A/h |
| Lift | 49° |
| Power reserve | 48h |
| Ruby | 17 |