In the early 1930ies, the Junghans caliber J80 debuted. It was one of their very first true inhouse wristwatch movement and was produced for about 20 years. Earlier versions had a seperate escape wheel cock, later versions, such as the J80/1 (which is only marked with “80”) has got the escape wheel bearing integrated into the gear train bridge.
While the base plate is metal colored, it was brass colored in earlier versions. You can see, that it is a true pallet lever movement with all important bearings equipped with jewels, those of the fourth and third wheel made out of a transparent jewel.
The J80/1 uses the standard gear train with a directly driven center minute wheel, followed by third wheel, seconds wheel (with decentral seconds hand) at 6 o’clock and finally the steel-made escape wheel.
The not yet shock protected screw balance beats contemporarily slow with 18000 A/h and regulates a classical swiss-type pallet lever movement. Its frequency can be adjusted with a long regulator arm.
The most notable part of the dial side of the Junghans J80/1 is the setting lever spring with its almost rectangular end part. The rest of the dial side looks absolutely standard.
The caliber 80 proved to be such a reliable construction, that in the early 1950ies, it was even taken as base caliber for the first senfwinding movement of Junghans - the caliber J80/12.
|Number of jewels:||15|
Nickel screw balance|
|Balance bearing / direction hairspring:||Clockwise|
|Adjust mechanism:||Long regulator arm|
|Construction type:||solid construction|
|Winding mechanism:||yoke winding system|
|Setting lever spring:||3 hole(s)|
|Functions:||hour, minute, decentral second|
|Size:||10 1/2''' (measured: 23,3mm)|
|Production period:||1931 - 1949|
Flume: 1947 31|