Junghans J90

Junghans J90 | 17jewels.info - The Movement Archive

Junghans J90


In all the years, Junghans only produced two cylinder escapement calibers, J90 and J91, where the caliber J91 is smaller, but construction-wise identical to the J90.

The Junghans J90 war released in 1932 and produced for only five years. It had a diameter of 10 1/2 lignes and used, depending on the execution, either one or fix jewels.

Since cylinder movement were already technically obsolete in the 1930s, its short production timespan is no wonder.

Junghans J90: base plate

base plate

The six-jewels version shown here uses a pair of bearing and cap jewels each for the balance wheel axle and two bearing jewels for the cylinder wheel axle.

Junghans J90: gear train

gear train

The gear train construction is typical for a cylinder movement: The mainspring barrel drives the center minute wheel, follwed by third wheel, seconds wheel at position 6 o’clock and the steel cylinder wheel.

Junghans J90: side view of the gear train

side view of the gear train

As balance, a very typical for cylinder movements, flat, screw-less, three-leg anular balance is used, which beats with 18000 A/h and whose beating rate can be adjusted roughly with a long regulator arm. “Roughly”, because these simple cylinder movements are generally pretty imprecise.

Junghans J90: Junghans J90: Dial side

Junghans J90: Dial side

On the dial side, you can see the well made ratchet and the yoke winding system.

The U-shaped balance wheel bearing was made this way, because you can shirt-sleeved correct the depthing of the cylinder wheel into the balance cylinder by bending the bearing, if required.

Technical data

Size:10 1/2''' (measured: 23,3mm)
Number of jewels:6
Balance types: monometallic anular balance (three legs)
Shock protection(s): none
Balance bearing / direction hairspring:Clockwise
Moveable stud:no
Adjust mechanism:Long regulator arm
  • cylinder wheel
  • seconds wheel, third wheel, center minute wheel, mainspring barrel
Construction type:solid construction
Winding mechanism:rocking bar winding system
Setting lever spring:4 hole(s)
  • s (decentral seconds)
References: Feilner: Bl.9 333
Flume: 1942 223 827
Jacob: 1942 14 016
Production years:1932-1937
Inventory number:22072

Usage gallery

Junghans J90: Ormo gents watch  (case missing)

Ormo gents watch (case missing)

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