From the 1930s dates ones of the earliest movements of the DuRoWe, the DuRoWe 202, which is, according to some sources, the military version of the DuRoWe 410.
It has got the standard diameter of 10 1/2 lignes and uses 15 jewels, some of them, probably due to war, transparent instead of ruby-red.
Even though the transparent rubies give an other impression, all important bearings contain rubies.
Only minute wheel and mainspring barrel use metal bearings, but that’s not a problem, since they rotate slowly and so don’t have friction problems.
The gear train uses the classical construction with mainspring barrel, directly driven center minute wheel, third wheel, decentral seconds wheel at 6 o’clock and finally the very filigree steel escape wheel. The latter is beared under an own cock.
The screw balance of the DuRoWe is of course not yet shock protected.
It beats with 18000 A/h, regulates a pallet lever movement of swiss type and can be adjusted with a long regulator arm.
On the dial side, you see the yoke winding system, whose setting lever spring war “repaired” a bit shirt-sleeved.
In the lab
Timegrapher resultThe pretty poor rates are probably caused by the age and wear of this well used movement.
|dial up||+21 s/d||214°||0.9ms|
|dial down||+3 s/d||196°||0.9ms|
|crown right (12 up)||-10 s/d||184°||1.1ms|
|crown up (3 up)||-40 s/d||175°||1.5ms|
|crown left (6 up)||-50 s/d||193°||1.1ms|
|crown down (9 up)||+42 s/d||173°||1.0ms|
|Size:||10 1/2''' (measured: 23,3mm)|
|Number of jewels:||15|
Nickel screw balance (two legs)|
|Balance bearing / direction hairspring:||Clockwise|
|Adjust mechanism:||Long regulator arm|
|Construction type:||solid construction|
|Winding mechanism:||yoke winding system|
|Setting lever spring:||2 hole(s)|
Jacob: 1942 13 11046