Dopas 131 SC

 
Dopas 131 SC

Dopas 131 SC

Description

The Dopas 131 SC, which was produced in Schwenningen, Germany, and also known as Palmtag 131 SC, is one of the movements, which were most probably made in the 1940s and which were then forgotten because of World War II.

It is a Roskopf construction, which is a bit unusual for a german movement. Because of the construction, it has got one reduction step less than normal lever movements.

base plate

base plate

It makes extensive use of bearing- and cap jewels, to reach the number of at least fifteen jewels, which was important for advertising reasons. At the time being, 15 jewels were the common number for a quality pallet lever movement.

gear train

gear train

The gear train is typical for a Roskopf construction: The large, uncovered mainspring barrel covers even the center of the movement, and requires the hand driving works to be on the dial side alone.

After the mainspring barrel, there are only two reduction wheels, where the last one drives the indirect center second.

Finally, there’s a steel escape wheel.

side view of the gear train

side view of the gear train

The Dopas 131 SC uses a screw-less anular balance with three legs, which is of course not yet shock-protected.

The effective length of the hairspring, and hence the beating frequency of the balance, is adjusted by a long regulator arm.

Detail: Lever

Detail: Lever

As escapement, a pin lever is used.

dial side without hour wheel

dial side without hour wheel

Hour and minute wheel are both driven by a double gear, which is mounted on top of the mainspring barrel and connected by a slip clutch.

Dopas 131 SC: Dial side

Dopas 131 SC: Dial side

On the dial side, there are also cap jewels. For the balance wheel bearing, this is normal, but here, the bearing for the escape wheel is also covered by a cap jewel.

Technical data

Manufacturer:Dopas
Caliber:131 SC
Number of jewels:15
Escapement:Pin lever
Balance types: Nickel anular balance
Shock protection(s): none
Balance bearing / direction hairspring:Counterclockwise
Moveable stud:no
Adjust mechanism:Long regulator arm
Construction:
  • lever
  • escape wheel, third wheel, large driving wheel, mainspring barrel, seconds wheel
Winding mechanism:yoke winding system
Setting lever spring:1 hole(s)
Features:SCI
Functions:hour, minute, (second)
Size:13''' (measured: 30,4mm)
Inventory number:20024

Usage gallery

Median Technic gents watch

Median Technic gents watch

This movement and watch is a kind donation from G.E.W. Gehrke to the movement archive. Thank you very much for your kind support.