The PUW 80, launched in the late 1950s, was a common tonneau movement in ladies’ watch size with a width of 6 3/4 lignes, so it already belongs to the larger tonneau movements.
As it should be for a quality product, all important bearings contain rubies. Since the mainspring barrel and the directly driven center minute wheel get enough force, ruby bearings are not neccessiary for them, and instead, the two escape wheel bearings got a cap jewel each, which is more useful.
The gear train follows the common scheme with directly driven center minute wheel, third wheel, seconds wheel and the final large escape wheel.
Due to the large diameter of the escape wheel, a two-storey construction was neccessiary, where the bearing of the seconds wheel is above the teeth of the scape wheel.
The screw balance of the PUW 80 is beared in two Ruby-Shock bearings and beats with 18000 A/h, whose frequency can be adjusted with a long regulator arm.
As escapement, a classical swiss pallet lever escapement was used.
On the dial side, you can see the yoke winding system, the shock protection bearing for the balacnce wheel and the cap jewel for the escape wheel.
In the lab
|Number of jewels:||17|
Nickel screw balance|
|Balance bearing / direction hairspring:||Counterclockwise|
|Adjust mechanism:||Long regulator arm|
|Construction type:||solid construction|
|Winding mechanism:||yoke winding system|
|Setting lever spring:||4 hole(s)|
|Size:||6 3/4''' (measured: 17,9 x 15,0mm)|
Flume: 1957 47|