In the late 1940ies, Thiel released the caliber “Präzisa”, which was very well made and a fulfilled its name perfectly.
During its production time and even afterwards, this 10 1⁄2 ligne caliber was renamed a few times, to ”UMF Präzisa”, to “UMF M 2” and finally to UMF 29-80.
The base plate is solidly milled and all bearings, except those from mainspring barrel and minute wheel are equipped with Rubies, in total 15. No comparison to the simple later UMF movements, as the caliber 23.
The UMF M2 / 29-80 has got the classical gear train with directly driven center minute, second wheel, third wheel, fourth wheel and escpament wheel. This was standard in the 1940ies and 1950ies.
The screw-less anular balance is (unfortunately!) not shock protected, but the movement has got a long regulator arm for adjusting the effective hairspring length.
The balance beats contemporarily slow with 18000 A/h and regulates a conventional pallet lever movement of swiss type.
On the dial side too, (here stamped as “UMF 2”) you are not disappointed, since the UMF 29-80 uses a yoke winding system.
|Number of jewels:||15|
Nickel anular 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)|
|Production period:||1948 - 1963|
Flume: 1958 g.4|