With a nominal size of only 5 lignes (12.0 x 15.5mm), the Universal 501 belongs to the smallest windup form movements for ladies’ watches.
It debuted in the late 1950s and shows several classical details.
Of course, all important bearings carry rubies; the minute wheel even has got one ruby bearing at the movement side, and the upper escape wheel bearing has got a Girocap cover stone.
Because of the limited space, the gear train is pretty compact and build the classical way: The mainspring barrel drives the center minute wheel, followed by third wheel, seconds wheel and escape wheel.
Seconds wheel and escape wheel are both located service-friendly under an own bridge.
The golden colored Glucydur screw balance with her two legs is beared in two Incabloc shock protections and beats slowly with a rate of 18000 A/h. The exact frequency can be adjusted with a long regulator arm.
On the dial side you see (besides a larger water damage) the yoke winding system and the rests of the (here unfortunately broken) Incabloc shock protection.
|Size:||5''' (measured: 12,0 x 15,5mm)|
|Number of jewels:||17|
Glucydur screw balance (two legs)|
|Balance bearing / direction hairspring:||Counterclockwise|
|Adjust mechanism:||Long regulator arm|
|Construction type:||solid construction|
|Winding mechanism:||yoke winding system|
|Setting lever spring:||3 hole(s)|
Ebauches: 1959 142|
Flume: K2 -