UMF 53-52 (M 9)

 
UMF 53-52 (M 9)

UMF 53-52 (M 9)

Description

The five-jewels caliber M 9, which after its discontinuation got is new name UMF 53-52 in the new caliber number system, is a simple pin lever movement with center second and ruby beared anular balance.

base plate

base plate

The brass colored base plate shows, that it a simple pillar construction. Aside from the balance wheel, none of the other bearings is equipped with synthetic rubies.

gear train

gear train

The gear train is a classical one with directly driven minute wheel, third wheel, fourth wheel and escapement wheel.

The indirectly driven center second is driven on the movement side by the third wheel.

side view of the gear train

side view of the gear train

The non shock protected anular balance has got ruby bearings for its cones and so a higher fracture risk. Its beats contemporarily slow with 18000 A/h and controls by a ruby ellipse a conventional pin lever movement, which builds pretty high.

By moving the locking lever on the movement side, the mainspring barrel can be released without dismantling the whole movement.

UMF 53-52 (M 9): Dial side

UMF 53-52 (M 9): Dial side

On the dial side, you can easily spot the rocking bar winding system, the currings for oiling the lever pins and the simple ratchet, which consists of only one simple spring.

Technical data

Manufacturer:UMF
Caliber:53-52
Number of jewels:5
Escapement:Pin lever
Balance types: Nickel anular 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
  • 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:10 1/2''' (measured: 23,5mm)
Production period:1960 - 1961
Literature: Flume: K2 -
Inventory number:17018