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- Zenith Cal. 1730 - Racket for regulating device, flat hairspring 309/2

| Brand | Zenith |
|---|---|
| Calibre | Zenith 1730 |
| International reference | 309/2 |
| State | Never used |
| Year of production | Circa 1967 |
| Caliber diameter | 17.5 mm |
| Caliber height | 2.7 mm |
| Frequency | 21'600 A/h |
| Power reserve | 38h |
| Ruby | 19 |