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Zenith Calibre 133.8 Movement Specifications, Beat Rate & Dimensions |
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Technical Caliber Datasheet
| Manufacturer | Zenith |
| Caliber Reference | Calibre 133.8 |
| Movement Type | Bumper Automatic |
| Diameter (Lignes) | 13''' |
| Diameter (mm) | 29.3 |
| Movement Thickness | 4.9 |
| Jewel Count | 20 Jewels |
| Vibrations Per Hour | 18,000 BPH (2.5 Hz) |
| Balance Lift Angle | 51° |
| Power Reserve | 42 hours |
| Escapement Type | Bumper spring rotor |
| Shock Protection System | Incabloc |
| Production Era | 1951-1958 |
| Wristwatch Conversion Rating | Zenith Captain / Automatic early |
Historical & Mechanical Notes
The Zenith Calibre 133.8 is revered among horologists for its mechanical architecture and precision timing characteristics. Operating with an oscillation rate of 18,000 BPH and a 51° lift angle, this movement exemplifies vintage fine watchmaking standards.
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