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BM 12820 Movement Specifications, Beat Rate & Dimensions |
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Technical Caliber Datasheet
| Manufacturer | BM |
| Caliber Reference | BM 12820 |
| Movement Type | Automatic |
| Diameter (Lignes) | — |
| Diameter (mm) | 28.55 mm |
| Height / Thickness | 3.25 mm |
| Jewel Count | 30 Jewels |
| Beat Rate / Frequency | 18,000 BPH |
| Lift Angle | 51° |
| Power Reserve | 38 hours |
| Escapement | Swiss Lever |
| Production Period | 1962 |
Historical & Mechanical Notes
The BM 12820 is a celebrated example of vintage precision engineering. Featuring 30 jewels and operating at 18,000 BPH, surviving examples are prized by collectors and restorers. For authentic restored timepieces and bespoke pocket-to-wrist conversions, visit AntiqueWrist Workshop.
Other BM Movements
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