Peseux 7050

 
Peseux 7050

Peseux 7050

Description

Video on YouTube

The 112 ligne Peseux 7050 is part of the final movement family from Peseux. It bases on flat base caliber 7040. The rest is identical.

There’s also a directly relative, the caliber Peseux 7070, which has got the same diameter, but is a little less flat because of a higher mainspring barrel.

The caliber family 7040-7077 was launched in the late 1960ies and consists of flat manual wind movement with or without date and/or day-date indication. There’s no center second indication, only (if desired) a decentral second indication at “6”.

base plate

base plate

On the massive base plate, you can see the enlargement, especially on the mainspring area.

All bearings, including those of the minute wheel, are equipped with ruby bearings, only the mainspring barrel doesn’t need them because of the low rotation speed and high torque.

gears and trains

gears and trains

Since many decades, the gear train is the same and goes back to the three-digit calibers from the 1940ies. The only thing, that has changed, apart from the slightly faster beat rate, is, that the minute wheel is now beared under the gear bridge and no longer under the winding bridge.

Like on early pocket watch movements, the gear train consists of a directly driven minute wheel, followed by second wheel, third wheel at “6” and finally the escapement wheel. With a prologed axle of the third wheel, you can have a decentral seconds indication.

side view of the gear train

side view of the gear train

The three leg anular balance is beared in two Incabloc shock protections and beats contemporarily fast with 21600 A/h.

An interesting, inasmuch as very modern constructed detail, is the ratchet of the Peseux 7050:

Ratchet

Ratchet

The ratched is a stamped part of metal, whose pivot sticks in the main plate, and whose two other pivots interfere with the ratchet wheel. This probably conserves the wheel and is also quite cheap.

Ratchet with spring

Ratchet with spring

The U-shaped spring is not connected to one of the pivots, but to the “nose” of the ratchet, which is below the ratchet wheel. A pragmatic and safe solution.

Peseux 7050 dial side

Peseux 7050 dial side

On the dial side, you can see, how flat the base plate is. It’s not 1100 of a millimeter too high.

The setting lever spring is characteristically shaped and also locks the wheels on the dial side.

Additionally, you can see the yoke winding system and the holes for oiling and checking the pallets.

In the lab

The specimen shown here was in good condition and probably comes from a pocket watch of the late 1970ies or early 1980ies. No service was required.

Timegrapher result

The timegrapher results are very well, only the amplitude is a little bit low, but that's absolutely OK for a movement, which is 30 or 40 years old and in need for an oil change. After that, it might even reach the chronometer specifications, which shows, what a great construction this movement is.

horizontal positions
dial up -7 s/d 249° 0.4ms
dial down 0 s/d 211° 0.3ms
vertical positions
crown right (12 up) -19 s/d 220° 0.2ms
crown up (3 up) -26 s/d 216° 0.1ms
crown left (6 up) -38 s/d 217° 0.5ms
crown down (9 up) -22 s/d 224° 0.5ms

Technical data

Manufacturer:Peseux
Caliber:7050
Number of jewels:17
Escapement:Pallet lever
Balance types: Nickel anular balance
Shock protection(s): Incabloc
Balance bearing / direction hairspring:Clockwise
Moveable stud:yes
Adjust mechanism:Hairspring key
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:2 hole(s)
Functions:hour, minute
A/h:21600
Size:11 1/2'''
Literature: Flume: K3 42

Usage gallery

Aero Watch pocket watch  (fragment)

Aero Watch pocket watch (fragment)