This site uses cookies for monitoring purposes. If you continue using this site, you accept this cookie policy.

UMF 33-50


UMF 33-50UMF 33-50


The UMF caliber 33-50 is one of older versions of the 8 3/4 ligne midsize caliber, called "Diva" or "M3". It has got no shock protection and only seven jewels, but already uses a pallet lever excapement.

It displays hour and minutes only.

The movement itself is very lean constructed and service friendly. On the dial side, almost the whole anchor wheel can be seen, just as on skeletonized movements.

As usual for UMF, this movement has got a rocking bar winding mechanism.

The later models of this movement were released as caliber 39-50.

UMF 33-50 dial sideUMF 33-50 dial side




 Technical data

Number of jewels7
EscapementAnchor with pallets
Shock protection(s)none
Balance cock directionclockwise
Hairspring studfixed
Regulator typeHairspring key
Movement constructionFork
Escapement wheel, Fourth wheel, Third wheel, Center wheel
Mainspring barrel
Winding mechanismRocking bar
Setting lever spring2 holes
FunctionsHour, minute
Beats per hour18000
Image in Flume Werksucher K3 17
UMF 33-50UMFUMF33-508 3/4''''''UMF 33-507 Jewels, 8 3/4'''''', 18000 A/h



Usage gallery

Ruhla ladies' watchRuhla ladies' watch