Berger 8 3/4

 
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Berger 8 3/4

Description

In the 1930ies or early 1940ies, the swiss manufactuer Berger, which is said to be a branch of Felsa AG of the Ebauches SA, produced that 8 34 ligne manual wind movement. In some parts of the literature, it is only called “Berger 8 34”, in others there are even three caliber numbers for it: Berger 16, Berger 38 and Berger 42.

base plate

base plate

The base plate offers a pleasant sight: All important bearings contain rubies (except mainspring barrel and center minute wheel, as usual) and below the balance wheel, there’s beautiful perleage.

gear train

gear train

The classical gear train impresses with its well made wheels. As usual, the mainspring barrel drives the center minute wheel, followed by third wheel, seconds wheel (which allows the use of a decentral seconds hand at 6 o’clock) and the polished steel escapement wheel.

side view of the gear train

side view of the gear train

The diameter of only 19.2mm (8 34 lignes) is rather small.

Nevertheless, this movement is a true swiss pallet lever movement, which is regulated by a non shock protected bimetallic screw balance, beating with 18000 A/h.

bimetallic balance

bimetallic balance

On this picture, you can very well see the two slits of the balance wheel, which makes the balance bending invard when the temperature rises. The movement of inertia descreases and compensates the temperature-decreasing tension of the blue steel hairspring.

Berger 8 3/4: Dial side

Berger 8 3/4: Dial side

Although the setting lever spring is broken on the specimen shown here, you can still see its characteristic shape, especially where it fixes the changing wheel.

Technical data

Manufacturer:Berger
Caliber:8 3/4
Escapement:Pallet lever
Balance types: Nickel screw balance
Shock protection(s): none
Balance bearing / direction hairspring:Clockwise
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:2 hole(s)
Functions:hour, minute
A/h:18000
Size:8 3/4''' (measured: 19,2mm)
Literature: Flume: 1947 19
Inventory number:18004

Usage gallery

anonyme Damenuhr  (ohne Gehäuse)

anonyme Damenuhr (ohne Gehäuse)

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