Baume & Mercier caliber BM13-1975 COSC

Ref. BM13-1975 COSC

The Baume & Mercier caliber BM13-1975 COSC is an automatic movement with a 120-hour power reserve, beats at 28,800 vph, and carries 21 jewels.

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. The present version is COSC-certified; the movement also comes in a non-certified version.

Type: Automatic
Display: Analog
Power reserve: 120 h
Frequency: 28800 vph
Jewels: 21
Diameter: 28.2 mm
Complications: Chronometer, Date, Hours, Minutes, Seconds
Base caliber: Baume & Mercier caliber BM12-1975M