The DuRoWe 410, whose origins date back the 1930ies (caliber 202), was a 10 1⁄2 ligne manual wind movement from Germany with a decentral seconds indication at 6 o’clock.
On the base plate, you can see the good quality of the movement: All important bearings are equipped with synthetic rubies, in total, this movement uses 15 jewels.
The DuRoWe 410 uses the traditional gear train with mainspring, directly driven center minute wheel, third wheel, seconds wheel at 6 o’clock and finally the steel escapement wheel, which is beared under an own cock.
The screw balance is of course not yet shock protected. It beats contemporarily slow with 18000 A/h and regulates a pallet lever escapement of swiss type.
With the long regulator arm, the exact beating frequency can be adjusted.
There are no surprises on the dial side. Of course, like on all better movements, a yoke winding system is used. You can see its characteristical shape, which helps on identifying the movement.
In the lab
Timegrapher resultThe values are quite presentable for the fact that the movement was completely resinated and entered the archive in an unviable state. A new mainspring and a new balance staff plus correction of the beat error is likely to deliver significantly better results.
|dial up||+59 s/d||156°||5.1ms|
|dial down||+68 s/d||224°||2.1ms|
|crown right (12 up)||-20 s/d||173°||5.3ms|
|crown up (3 up)||+47 s/d||214°||4.5ms|
|crown left (6 up)||+25 s/d||199°||4.1ms|
|crown down (9 up)||-99 s/d||206°||3.9ms|
|Number of jewels:||15|
Nickel screw balance|
|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)|
|Functions:||hour, minute, decentral second|
|Size:||10 1/2''' (measured: 23,3mm)|
Flume: 1947 27|