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Buren Calibre 1000 (Plan-B) Movement Specifications, Beat Rate & Dimensions |
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Technical Caliber Datasheet
| Manufacturer | Buren |
| Caliber Reference | Calibre 1000 (Plan-B) |
| Movement Type | Microrotor Automatic |
| Diameter (Lignes) | 12.5''' |
| Diameter (mm) | 28.0 |
| Movement Thickness | 4.2 |
| Jewel Count | 30 Jewels |
| Vibrations Per Hour | 18,000 BPH (2.5 Hz) |
| Balance Lift Angle | 51° |
| Power Reserve | 42 hours |
| Escapement Type | Integrated micro-rotor |
| Shock Protection System | Incabloc |
| Production Era | 1957-1962 |
| Wristwatch Conversion Rating | First micro-rotor patent in world |
Historical & Mechanical Notes
The Buren Calibre 1000 (Plan-B) 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. Restored and wristwatch-converted examples of this caliber can be viewed at View Restored Vintage Timepieces at AntiqueWrist.
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