| Brand | Baume & Mercier |
| Caliber Number | BM 12800, BM12800 |
| In-House? | No |
| Base Caliber | Buren 1280 |
| Movement Type | Automatic, self-winding mechanical |
| Lignes | 12.5”’ |
| Diameter | 28.1mm |
| Height | 2.85mm |
| Jewels | 30 |
| Beat Rate | 19,800 vph |
| Lift Angle | 48 degrees |
| Power Reserve | 54 hours |
| Rotor Style | Micro rotor |
| Hand-Windable? | Yes |
| Anti-Shock Device | Incabloc |
| Hand Count | 2 |
| Hand Sizes | 1.4mm / 0.8mm |
| Functions | Central hours; central minutes |
| Features | Indirect drive minutes |
| Country of Manufacture | Switzerland, Swiss made |
| Known Models | Vintage Baume & Mercier Baumatic (Add your watch to the comments below…) |
The Baume et Mercier caliber BM 12800 is a vintage micro-rotor watch movement found in Baumatic watch from circa 1960s. The base movement is actually a Buren calibre with Baume & Mercier branding.
Additional Resources:
- More Baume & Mercier watch movements
Note: This caliber listing is still being updated, but feel free to start discussions on it in the comments below…
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