Felsa 690

 
Felsa 690

Felsa 690

Description

The Felsa Bidynator movement (here caliber 690, the second generation of “Bidynator” movements), was the first one, to wind in both rotor directions. It is the precessor of the modern selfwindig wristwatch.

Technical data

Manufacturer:Felsa
Caliber:690
Number of jewels:17
Escapement:Pallet lever
Balance types: Nickel screw balance
Shock protection(s): Incabloc
Balance bearing / direction hairspring:Clockwise
Adjust mechanism:Swan neck
Features:SCD,AUT
Functions:hour, minute, second, selfwinding
A/h:18000
Size:11 1/2'''
Production period:1947-
Literature: Flume: 1949 I 54