The PUW caliber 1075 is a typical ladies’ form watch movement of the common size of 5 1⁄2 lignes. From the mod 1960ies, it was one of the successors of the PUW 74. Since in 1967, it successfully passed the national quality inspection, you can assume, that it was available sine the mid 1960ies.
The only difference between this movement and its predecessor PUW 74, has got cap jewels for the escapement wheel instead of bearing jewels for the minute wheel.
The three-arm annular balance of the specimen shown here is beared in a pair of RUFA-Anti-Shock protection bearings.
Dugena used that movement and gave it their own number “Dugena 2500”.
On the dial side, you can see the yoke winding system.
In the lab
The specimen shown here arrived in good condition, so there was no need for a service.
Since it ran a bit fast, it was adjusted minimally, so that the mean deviation is pretty low now:
The ampliture readings refer to the standard lift angle of 52°. It's not known, what is the real lift angel of the PUW 1075.
But according to the timegrapher result, this movement seems to have a large position error, maybe caused by a shock. Otherwise the rates are absolutely OK for a movement of that tiny size.
|dial up||-23 s/d||225°||0.1ms|
|dial down||+16 s/d||239°||0ms|
|crown right (12 up)||+2 s/d||201°||0.6ms|
|crown up (3 up)||+2 s/d||206°||0.2ms|
|crown left (6 up)||-33 s/d||196°||0.1ms|
|crown down (9 up)||-20 s/d||197°||0.3ms|
|Number of jewels:||17|
Nickel anular balance|
|Balance bearing / direction hairspring:||Counterclockwise|
|Adjust mechanism:||Hairspring key|
|Construction type:||solid construction|
|Winding mechanism:||yoke winding system|
|Setting lever spring:||3 hole(s)|
|Size:||5 1/2''' (measured: 13,0 x 15,2mm)|
Flume: K3 77|