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- Rolex Cal. 775 - Lower endpiece with endstone 5931

| Brand | Rolex |
|---|---|
| Calibre | RX 775 |
| International reference | 5931 |
| Compatibility | 720-730-740-765 |
| State | Never used |
| Year of production | 1950-1955 |
| Caliber diameter | 29.50 mm |
| Caliber height | 6.92 mm |
| Frequency | 18'000 A/h |
| Lift | 43° |