Junghans J68

Junghans J68 | 17jewels.info - The Movement Archive

Junghans J68


In the 1930s, Junghans produced this officially 20 ligne diameter measuring stopwatch caliber, which in reality had a diameter of only 18 1/2 lignes.

Junghans J68: base plate

base plate

As easy to see, this movement lacks bearing rubies; only the balance wheel is beared in two pairs of them (bearing ruby and cap jewel), all other pinions are beared in simple drillings.

Since a stopwatch does not run 24/7, this is perfecly acceptable.

Junghans J68: gear train

gear train

The gear train is standard with the mainspring barrel, the excentrical minute wheel at 12 o’clock (revolving twice per hour), the third wheel, directly driven center seconds wheel and steel escape wheel.

Junghans J68: lever with steel pallets

lever with steel pallets

There’s an oddity with the lever, unlike on most other pallet lever escapements, there are no ruby pallets here, but steel pallets.

Junghans J68: side view of the gear train

side view of the gear train

There were two versions of the Junghans J68, once the version shown here, where the balance wheel beats with 18000 A/h, which allows a precision of 1/5 seconds, and one version with double speed (36000 A/h), with a precision of 1/10 seconds.

The adjustment is done with a long regulator arm.

Junghans J68: balance wheel with wide hoop

balance wheel with wide hoop

The especially flat and wide anular balance is not shock protected and uses, like the lever, an ellipse made of steel.

Above the balance wheel, there’s a flat spring, which breaks in stop position the center seconds wheel. Connected to it is the spring loaded lever, which stops and starts the balance wheel.

Junghans J68: Junghans J68: Dial side

Junghans J68: Dial side

On the dial side, there’s the column wheel mechanism, which only knows the positions stop and start.

The reset of the hands can be done any time, even during measuring (“flyback”) by the lever at position 11 o’clock.

At position 5:30, you can see the lever mechanism, described above.

Technical data

Size:20''' (measured: 41,3mm)
Number of jewels:4
Escapement:Pallet lever
Balance types: monometallic anular 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
  • CHR (chronographe)
Production period:1932 - 1937 (1945?)
Inventory number:22065

Usage gallery

Junghans J68: Kochendörffer stopwatch

Kochendörffer stopwatch

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