The french Parrenin 660 (marked as “CHP 660”), which was obtained in Parts by Emes, finished there and used under their caliber numbers Emes 17 and Emes 17a is a 10 1⁄2 ligne pin lever movement with balance bridge.
It was probably released around 1970 and was available with and without shock protection. The Emes 17a used a german Rufa-Anti-Shock bearing for the balance wheel.
This movement is a simple pin lever construction.
You find ruby bearings only for the balance, all other bearings are made of brass.
On the left, you see the plastic bearing block for the yoke winding system. Using plastic was very popular these days. Unlike the Parrenin 66 it uses a screwed crown wheel.
There’s the standard gear train for a pin lever movement with directly driven center minute, third wheel, seconds wheel and escape wheel.
The two-leg anular balance is beared below the balance bridge. It regulates a pin lever movement with a very flat, top-down lever, on which its pins point to the base plate.
The balance beats with 18000 A/h and can be adjusted with the hairspring key only. There were versions with and without moveable hairspring stud, which allows to minimize the beat error.
On the dial side you see the yoke winding system, whose cut out setting lever is also the setting lever spring and the cap for the change wheel. A very simple, but really clever detail.
|Number of jewels:||5|
Nickel anular balance|
|Balance bearing / direction hairspring:||Bridge|
|Adjust mechanism:||Hairspring key|
|Construction type:||pillar construction|
|Winding mechanism:||yoke winding system|
|Setting lever spring:||1 hole(s)|
|Size:||10 1/2''' (measured: 23,2mm)|