Baume & Mercier caliber BM13-1975

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

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.