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- AS Cal. 1690 - Top balance-endpiece 311

| Brand | AS |
|---|---|
| Calibre | AS 1690 |
| International reference | 311 |
| Compatibility | 1691-1692-1693 |
| State | Never used |
| Year of production | Circa 1960 |
| Caliber diameter | 23.30 mm |
| Caliber height | 4.00 mm |
| Frequency | 18'000 A/h |
| Lift | 52° |
| Power reserve | 50h |
| Ruby | 17/21/25 |