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- ETA Cal. 2550 - Screw for automatic device framework 51134

| Brand | ETA |
|---|---|
| Calibre | ETA 2550 |
| International reference | 51134 |
| Compatibility | 2540-2541-2544-2545-2551 |
| State | Never used |
| Year of production | 1965 - 1972 |
| Caliber diameter | 17.20 mm |
| Caliber height | 4.65mm |
| Frequency | 21'600 A/h |
| Lift | 51° |
| Power reserve | 42h |
| Ruby | 18 |