UMF 52-32 (M44)

 
UMF 52-32 (M44)

UMF 52-32 (M44)

Description

In 1938, the Gebrüder Thiel GmbH in Ruhla, Germany, launched the caliber “Start”, a simple pin lever movement without jewels, which was made until the 1960ies. Its further development was the caliber “Chronos”, starting in 1950, which contained an indirectly driven center second indication and was constructed from the beginning with a balance bridge.

The last, 8th, version, which was released 1959, got the official name “UMF 44” and was made until 1963. The specimen shown here was made in the 26th week of 1962.

Video on YouTube
base plate

base plate

The brass base plate is punched and little decorated with a dot pattern. The upper plate is beared on three pillars.

You can see the simple click mechanism, which consists only of one single piece, a punched click spring.

gears and trains

gears and trains

The construction of the UMF 44 is simple and clean: Mainspring (at “11:30”), directly driven center minute wheel, second wheel, third wheel and escapement wheel. The latter one is controled by a pin lever. The screwless ring balance, which is not shock protected is beared in two ruby-less pivot bearings under a bridge.

The indirectly driven center second hand is driven by a second gear on the second wheel.

side view of the gears

side view of the gears

As on all Ruhla pin lever movement, it builds very high, which makes it a bit difficult to put the escapement lever under its cock. The pro side of this construction is, that it is pretty rugged.

UMF 44 dial side

UMF 44 dial side

On the dial side, you see the height-adjustable pivot bearing at “9”, and the rocking bar winding mechanism.

In the lab

The specimen shown here was completely gummed and got a full service. It was adjusted as far as possible, and even the hairspring needed a minor correction, but the enormous beat error was not resolved.

Timegrapher result


crown right (12 up)

crown right (12 up)

crown up (3 up)

crown up (3 up)

crown left (6 up)

crown left (6 up)

crown down (9 up)

crown down (9 up)

dial up

dial up

dial down

dial down


horizontal positions
dial up+25 s/d
dial down+20 s/d
vertical positions
crown right (12 up)+30 s/d
crown up (3 up)-150 s/d
crown left (6 up)+35 s/d
crown down (9 up)+130 s/d
Timegrapher output

Technical data

Manufacturer:UMF
Caliber:54-32
Escapement:Pin lever
Balance types: Nickel anular balance
Shock protection(s): none
Balance bearing / direction hairspring:Bridge
Moveable stud:no
Adjust mechanism:Long regulator arm
Construction:
  • lever
  • escape wheel, seconds wheel, third wheel, large driving wheel, mainspring barrel
  • center second pinion
Construction type:pillar construction
Winding mechanism:rocking bar winding system
Setting lever spring:1 hole(s)
Features:SCI
Functions:hour, minute, second
A/h:18000
Size:12''' (measured: 27,0mmmm)
Production period:1950-1963
Literature: Flume: K2 -

Usage gallery

UMF Ruhla mens' watch

UMF Ruhla mens' watch

Links