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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 platebase 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 traingear 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 trainside 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 sideUMF 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

ManufacturerUMF
Caliber53-52 (M 9)
Number of jewels5
Escapementpin lever
BalanceNickel
Shock protection(s)none
Balance cock directionclockwise
Hairspring studfixed
Regulator typeHairspring key
Movement constructionFork
Escapement wheel, Fourth wheel, Third wheel, Center wheel, Mainspring barrel
Center second pinion
Construction typepillar construction
Winding mechanismRocking bar
Setting lever spring1 holes
FeaturesSCI
FunctionsHour, minute, second
Beats per hour18000
Size101/2''' (measured: 23,5 mm)
Production time1960 - 1961
Image in Flume Werksucher K2 -
Inventory ID 17018
UMF 53-52UMFUMF53-521960 - 196110 1/2'''UMF 53-525 Jewels, 10 1/2''', 18000 A/h, SCI
Factsheet

 

 

 

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