In the 1950ies and 1960ies, this movement was made in the Czech Republic. Since it it an early specimen, its caliber number is Prim 0111. Later, the caliber number was changed to Prim 52, as you will find in the literature.
The construction fascinated by bevelled angles and a breguet-shaped hairspring.
|Number of jewels:||15|
Nickel screw balance|
|Balance bearing / direction hairspring:||Clockwise|
|Adjust mechanism:||Breguet type hairspring, long regulator arm|
|Production period:||1962 - 1965|