As so often on cylinder movements from the early 20th century, this movement could not be identified, too.
On closer inspection, it reminds a bit of a Pontenet movement, but this is not a 100% match, so it will remain a mystery, who was the manufacturer of this 10 1/2 ligne cylinder movement.
For a cylinder movement, it is of fair quality, all important bearings contain rubies.
The gear train is typical for a cylinder movement without decentral seconds indication, as the seconds wheel is neither perpendicular nor at 90° angle to the winding stem.
As every cylinder movement, is uses a directly driven center minute wheel, followed by third wheel, seconds wheel and steel cylinder wheel.
This movement uses a non shock protected three-leg anular balance. The length of the hairspring can be regulated with a long regulator arm to approximate the 18000 A/h. Since it is a cylinder movement, this can really be only an approximation, a daily deviation of a few minutes is standard for these kind of movements, especially after longer use.
Interestingly, this movement already uses a yoke winding system with a setting lever and not with a sideways pin, as many cylindermovements did.
So, altogether, this is a well made cylinder movement, probably from the 1910s.
|Size:||10 1/2''' (measured: 23,3mm)|
|Number of jewels:||9|
monometallic anular balance (three legs)|
|Balance bearing / direction hairspring:||Counterclockwise|
|Adjust mechanism:||Long regulator arm|
|Construction type:||solid construction|
|Winding mechanism:||yoke winding system|