Peseux 120

 
Peseux 120

Peseux 120

Description

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 14 ligne movement, which debuted in the 1940ies.

main plate

main plate

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.

gear train

gear train

The multi-storey gear train allows rather large wheels.

side view of the gear train

side view of the gear train

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.

double crown wheel

double crown wheel

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.

Peseux 120 dial side

Peseux 120 dial side

There are no surprises on the dial side, where you can see the yoke winding system and the Peseux hallmark.

Timegrapher result

The specimen shown here was heavily worn, when it came into the archive. Since it still showed fail rates, no revision was made.

horizontal positions
dial up -45 s/d
dial down +65 s/d 282° 1.6ms
vertical positions
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

Technical data

Manufacturer:Peseux
Caliber:120
Number of jewels:15
Escapement:Pallet lever
Balance types: Nickel screw balance
Shock protection(s): none
Balance bearing / direction hairspring:Counterclockwise
Moveable stud:no
Adjust mechanism:Long regulator arm
Construction:
  • lever
  • escape wheel, seconds wheel, third wheel, center minute wheel
  • mainspring barrel
Construction type:solid construction
Winding mechanism:yoke winding system
Setting lever spring:3 hole(s)
Functions:hour, minute
A/h:18000
Size:5 1/4''' (measured: 13,7 x 19,2mm)
Literature: Flume: 1947 129
Inventory number:16014

Usage gallery

Blumus ladies' watch

Blumus ladies' watch

This movement and watch are a kind donation by Erwin. Thank you very much for supporting the movement archive!