If you think of Peseux, the swiss ebauche manufacturer, you instantly think of their flat gents watch movements, starting from caliber 320 till their caliber series 7000, whose most successful variant, the caliber 7001, is produced until today by the ETA.
If you think of Peseux, you hardly think of tiny ladies’ watch form movement, and so these kind of movements are pretty rare and hard to find.
The Peseux 120 shown here is a 5 1⁄4 ligne movement, which debuted in the 1940ies.
The main plate shows the typical construction of a tiny ladies’ watch form movement. All important bearings, except minute wheel and mainspring barrel are equipped with rubies. A noteable detail of the Peseux 120 is, that balance, wheel, lever and escapement wheel are on one line.
The multi-storey gear train allows rather large wheels.
The two leg screw balance is not shock protected and beats contemporarily slow with 18000 A/h. It regulates a conventional swiss pallet lever movement.
The most interesting feature of this work is the double crown wheel. The lower, inner tooth ring engages in the coupling wheel, the upper, inner tooth ring in the ratchet wheel. In this way, the crown wheel is relatively large in diameter and the forces transmitted to the ratchet wheel are somewhat less.
There are no surprises on the dial side, where you can see the yoke winding system and the Peseux hallmark.
Timegrapher resultThe specimen shown here was heavily worn, when it came into the archive. Since it still showed fail rates, no revision was made.
|dial up||-45 s/d|
|dial down||+65 s/d||282°||1.6ms|
|crown right (12 up)||-136 s/d|
|crown up (3 up)||-73 s/d|
|crown left (6 up)||-88 s/d|
|crown down (9 up)||-109 s/d|
|Number of jewels:||15|
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:||3 hole(s)|
|Size:||5 1/4''' (measured: 13,7 x 19,2mm)|
Flume: 1947 129|