UMF 39-80

 
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UMF 39-80

Description

Between 1955 and 1963, the east german VEB Uhren und Maschinenfabrik Ruhla produced the 15 jewels caliber UMF 39-80, also known as “UMF M 3D”, which belonged to the “Diva” caliber family.

This version of the 8 34 ligne movement had no shock protection.

base plate

base plate

Unlike the direct relative UMF 39-50, the caliber 39-80 no longer reveals its former pin lever construction and the base place now reminds of a true pallet lever movement.

All important bearings are now equipped with rubies and the cutouts for the escape wheel are much smaller now, there are only two holes for oiling the lever pallets from the dial side.

gear train

gear train

The gear train is the traditional construction with directly driven center minute wheel, third wheel, seconds wheel a 6 o’clock and escape wheel.

side view of the gear train

side view of the gear train

The UMF 39-80 is in fact a pillar construction, but the use of a massive housing around the gear train, this is hidden very well. Only the balance cock, which sits on top of two pillars, relevals it.

The screw-less anular balance, which beats with the traditional 18000 A/h is not shock protected and regulates a swiss type pallet lever movement.

UMF 39 80: Dial side

UMF 39 80: Dial side

On the dial side, you see the rocking bar winding system and the well made ratchet.

Technical data

Manufacturer:UMF
Caliber:39-50
Number of jewels:7
Escapement:Pallet lever
Balance types: Nickel screw balance
screw balance
Shock protection(s): none
Balance bearing / direction hairspring:Clockwise
Moveable stud:no
Adjust mechanism:Hairspring key
Construction:
  • lever
  • escape wheel, seconds wheel, third wheel, center minute wheel
  • mainspring barrel
Construction type:pillar construction
Winding mechanism:rocking bar winding system
Setting lever spring:2 hole(s)
Functions:hour, minute
A/h:18000
Size:8 3/4''' (measured: 19,8mm)
Literature: Flume: K3 17
Inventory number:17044

Usage gallery

unmarked ladies' watch

unmarked ladies' watch

UMF ladies' watch (still with old "5 jewels" dial)

UMF ladies' watch (still with old "5 jewels" dial)

This movement is a kind donation from Mario. Thank you very much for supporting the movement archive!