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- ETA Cal. 2640 - Winding pinion

| Brand | ETA |
|---|---|
| Calibre | ETA 2640 |
| International reference | 410 |
| Compatibility | 2641-2648-2650-2651-2658-2660-2661-2668-2670-2671-2675-2678 |
| State | Never used |
| Year of production | 1971 - 1980 |
| Caliber height | 3.50 mm |
| Frequency | 21'600 A/h |
| Lift | 53° |
| Power reserve | 48h |
| Ruby | 17 |