Baume & Mercier caliber BM13-1975 COSC

Brand:Baume & Mercier
Reference:BM13-1975 COSC
Base: Baume & Mercier BM12-1975M
Movement:Automatic
Display:Analog
Diameter:28.20
Jewels:21
Reserve:120
Frequency:28800
Date:Date
Hands:Hours, Minutes, Seconds
Additionals:Chronometer

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

All watches using this caliber: