The Buser 8 3⁄4 caliber probably originates from the 1920ies. It is a midsize manual wind movement, well executed with pallet lever escapement and bimetallic screw balance.
The golden or gilt toned base plate shows an impressive degree of finshing, all important bearings contain synthetic rubies and each gear has got an individual deepening on the base plate.
The gear train is the classical one with center minute wheel, third wheel, seconds wheel at 6 o’clock and steel escapement wheel. As you can see, the execution of the gears is very well!
Especially the side view shows, that the gears are not only simply cut out, but they have an interesting three-dimensional structure. This is an indication, that this movement was one of the better ones.
Its non shock protected bimetallic screw balance beats with 18000 A/h and regulates a classical swiss pallet lever movement.
The usage of a bimetallic balance allows the temperature compensation of the steel hairspring.
On the dial side of this movement, you see the yoke winding system and the setting lever spring, which is very short and in a characteristical shape, but does not really work as a spring.