Blum 10 3/4

Blum 10 3/4 | - The Movement Archive

Blum 10 3/4


Unfortunately, nothing is known of this wonderful 10 1/2 ligne lever movement, that might be helpful for his identification, only the marking “38.6” might be a clue.

Blum 10 3/4: base plate

base plate

The nase plate pleases with its perlage in the visible area.

Of course, all important bearings are equipped with rubies.

Blum 10 3/4: gear train

gear train

The classic gear train construction is used with a directly driven center minute wheel, followed by third wheel, seconds wheel at 6 o’clock and finally the steel escape wheel.

Blum 10 3/4: side view of the gear train

side view of the gear train

Of course, the two-legged bimetallic screw balance is not yet shockproof. It beats with 18000 alternations per hour and regulares a swiss pallet lever movement.
The exact frequency can be adjusted with the help of a long regulator pointer arm.

Blum 10 3/4: dial side

dial side

On the dial side it is noticeable that from the Breguet ratchet to the hands works, two change wheels are used instead of the usual single change wheel.

The yoke winding system is constructed comparatively simply and partially embedded in the base plate.

Technical data

Caliber:10 3/4
Size:10 3/4''' (measured: 23,2mm)
Number of jewels:15
Escapement:Pallet lever
Balance types: bimetallic screw 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:yoke winding system
  • s (decentral seconds)
Inventory number:22002

Usage gallery

Blum 10 3/4: probably from a wrist watch

probably from a wrist watch

This movement is a kind donation from Klaus Brunnemer to the movement archive. Thank you very much for your great support!