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 |
| Size: | 11 1/2''' |
| A/h: | 18000 |
| 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: |
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| Production period: | 1947- |
| References: | Flume: 1949 I 54 |
| Mentioning in literature (years): | 1959 |
| Data sheet: | 1952, 1953 |