Kasper 900

 
Kasper 900

Kasper 900

Description

The Kasper 900 is rather rare pallet lever movement of the late 1950ies. Its construction was contemporarily modern with a directly driven center second and a Monorex shock protection. It was available with 17 and 21 jewels.

version with 21 jewels

version with 21 jewels

Since it was equipped with a screw balance and a long regulator arm it could achieve good precision results, although it was beating with the still modern slow beating frequency of 18000 A/h.

Video on YouTube

The clearly arranged construction with its slanted hat-shapred gear bridge is nice to see.

gear train

gear train

The gears work as following:
Mainspring barrel - center minute wheel - third wheel, center second wheel - escapement wheel.

side view of the gear train

side view of the gear train

In the side view, you can see the stacked construction, where the center minute wheel is beared under an own bridge with two jewel bearings. Above that, there’s the center second wheel.

The toothing of the escapement wheel is interesting, since it has got two toothings, of which only the upper one is used for the connection to the center second wheel.

base plate

base plate

The jewel bearing of the minute wheel is a bit unusual and technically not really neccessiary, but it helps easier achieving the popular number of 17 rubis.

Kasper 900 dial side

Kasper 900 dial side

Also on the dial side, the Kasper 900 makes a very clean appealing. The only noteable thing is the odd shape of the setting lever spring of the yoke winding system, which reminds of a bent-to-back arm.

dial side of the 21 jewels version

dial side of the 21 jewels version

Technical data

Manufacturer:Kasper
Caliber:900
Number of jewels:17/21
Escapement:Pallet lever
Balance types: Nickel screw balance
Shock protection(s): Monorex
Balance bearing / direction hairspring:Clockwise
Moveable stud:no
Adjust mechanism:Long regulator arm
Construction:
  • lever
  • escape wheel, seconds wheel, third wheel
  • center minute wheel
  • mainspring barrel
Construction type:solid construction
Winding mechanism:yoke winding system
Setting lever spring:2 hole(s)
Features:SCD
Functions:hour, minute, second
A/h:18000
Size:10 1/2''' (measured: 23,2mm)
Literature: Flume: 1957 31
Inventory number:17013

Usage gallery

E.B.P. Monorex gents watch

E.B.P. Monorex gents watch

Anker gents watch

Anker gents watch

Links

The version with 21 jewels, including the watch with the black dial, is a kind donation of the Ristow family. Thank you very much for the support of the movement archive!