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- Zenith Cal. 2511 - Screw for balance cock 5121/3

| Brand | Zenith |
|---|---|
| Calibre | Zenith 2511 |
| International reference | 5121/3 |
| State | Never used |
| Year of production | Circa 1958 |
| Caliber diameter | 26 mm |
| Caliber height | 3.6 mm |
| Frequency | 18'000 A/h |
| Power reserve | 50h |
| Ruby | 18 |