Description
The diameter is 11 1/4 lignes and it beats with 21600 A/h. The balance runs in two shock protection systems with three legs; on the movement side with a jewel, on the dial side only with a steel plate. The balance drives a pin lever, the center second hand is directly driven while the cannon pinion is driven indirectly by the mainspring barrel.
Technical data
| Manufacturer: | Sonceboz |
| Caliber: | ES 55 |
| Size: | 11 3/4''' |
| A/h: | 21600 |
| Number of jewels: | 1 |
| Escapement: | Pin lever |
| Balance types: |
Nickel anular balance |
| Shock protection(s): |
Brac Dip Resomatic |
| Balance bearing / direction hairspring: | Clockwise |
| Moveable stud: | yes |
| Adjust mechanism: | Hairspring key |
| Construction: |
|
| Winding mechanism: | yoke winding system |
| Setting lever spring: | 1 hole(s) |
| Features: |
|
| Production period: | 1978 - ? |