UMF 80-52

UMF M 65 A, version e

UMF 80-52 | - The Movement Archive

UMF 80-52


Between 1953 and 1963 this 18 1/2 ligne stopwatch caliber UMF M65 (here in version M 65 A with a 1/10 seconds resolution) was made, later called UMF 80-52.

It was originally made in Glashütte as GUB 65, and then, 1953, the production shifted, with a few modifications, to Ruhla.

The movement shown here is the pretty late version “e”, which e.g. has got the caliber number on the dial side, but still uses a long regulator arm.

UMF 80-52: base plate

base plate

Quality-wise it is quite well made for a stopwatch, two bearing- and cap jewel pairs for the balance wheel, one for the ellipse and two for the lever pallets, in total the UMF 65A (UMG 80-52) uses seven jewels.

UMF 80-52: gear train

gear train

The gear train is standard for this kind of stopwatch calibers: Mainspring barrel, decentral minute wheel at 12 o’clock, third wheel, center seconds wheel and steel escape wheel.

UMF 80-52: side view of the gear train

side view of the gear train

The UMF M65 uses a two-leg anular balance, which beats, according to which kind of hairspring is used, either with 18000 or 36000 A/h. This means, that without any changes in the gear train, the minimum resolution is 1/5 or 1/10 seconds.

Of course, the balance wheel is not yet shock protected, but its beating rate can be adjusted with a long regulator arm.

UMF 80-52: UMF 80-52 (M 65 A): Dial side

UMF 80-52 (M 65 A): Dial side

The control (start - stop - reset) happens by the column wheel on the dial side.

It is driven by an L-shaped lever, which translates the crown pushes into advancing of the wheel. In its upper part, two levers engage. The top lever falls in “reset” position and resets the hearts of the minute- and center second hands. The lower lever starts and stops the balance wheel it a tiny spring lever at position 5:30. It also ensures, that when the stopwatch is started, the balance wheel instantly starts beating.

Technical data

Caliber:80-52 (M 65 A)
Caliber base:UMF 80-52 (M 65)
Size:18 1/2''' (measured: 41,9mm)
Number of jewels:7
Escapement:Pallet lever
Balance types: monometallic anular balance (two legs)
Shock protection(s): none
Balance bearing / direction hairspring:Clockwise
Moveable stud:no
Adjust mechanism:Long regulator arm
  • lever
  • escape wheel, seconds wheel, third wheel, center minute wheel, mainspring barrel
Construction type:solid construction
Winding mechanism:rocking bar winding system
  • CHR (chronographe)
Production period: - 1963
References: Flume: (K2 -)
Inventory number:22067

Usage gallery

UMF 80-52: UMF stopwatch (1/10 seconds)

UMF stopwatch (1/10 seconds)

This movement and watch is a kind donation from Marco Bublitz to the movement archive. Thank you very much for your great support!