Felsa was a manufactury, which was known for their quality movements. The large caliber 465N with 11 1/2 lignes was one of them. It has got a direct driven center second hand and a kind of sandwitch construction, which allows larger sizes of the parts and thus higher precision and longevity.
In another version, this movement was equipped with an Incabloc shock protection and a normal cap jewel.
In contrast to caliber 465, the caliber 465N has got a little cruder bridges.
The base plate of this movement shows, that it its gear train is built in counterclockwise direction. All important bearings, except of those for the mainspring barrel and minute wheel are equipped with rubies.
As common for movements of the 1950ies, there’s a central minute wheel, which is here beared under a bridge and not only under a cock.
It’s the usual gear train for the 1950ies: Directly driven center minute wheel, on top the third and seconds wheel and finally the escapement wheel.
The reason, why Felsa used that very space saving gear train with balance wheel at 6 o’clock, while at the same time, there’s a lot of unused space, is unknown.
One thing is for sure, and that’s, that the screw balance beats with 18000 A/h and regulates a swiss pallet lever movement. The effective length of the hairspring can be adjusted by a long regulator arm.
A speciality of of one specimen this movement unfortunately cannot be seen in the pictures: The pallets of the anchor are made of a almost translucent, a very little blueish material. Probably this was better (and more expensive) as the normally used synthetic rubies.
On the dial side, you can easily see the yoke winding system with its characteristically shaped setting lever spring (unfortunately broken on this specimen) and the engraved partial minute dial, which helps adjusting the movement when it’s not yet put into a case.
|Number of jewels:||17|
Nickel screw balance|
|Balance bearing / direction hairspring:||Clockwise|
|Adjust mechanism:||Long regulator arm|
|Construction type:||solid construction|
|Winding mechanism:||yoke winding system|
|Setting lever spring:||3 hole(s)|
|Functions:||hour, minute, second|
|Size:||11 1/2''' (measured: 25,6mm)|
Flume: K2 -|