Baume & Mercier caliber BM13-1975
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| Brand: | Baume & Mercier |
|---|---|
| Reference: | BM13-1975 |
| Base: | Baume & Mercier BM12-1975M |
| Movement: | Automatic |
| Display: | Analog |
| Diameter: | 28.20 |
| Jewels: | 21 |
| Reserve: | 120 |
| Frequency: | 28800 |
| Date: | Date |
| Hands: | Hours, Minutes, Seconds |
BM13-1975 description
Caliber BM13-1975A 'Baumatic' is a self-winding movement based on the BM12 movement. Most notable difference is the missing TwinSpir balance spring -made of two layers of silicon due- to patent issues. It is also available in a COSC-certified version.