In the early 1930ies, the Junghans caliber 80 debuted, one of their first true inhouse wristwatch movements. It was produced for almost 20 years. The earliest versions, as shown here, had a separate escape wheel cock. It was available with different numbers of jewels, starting from 7, up to 17 jewels.
The yellow burnt base plate gives a throwback to the 1930ies. At that time, it was usual, that cheaper movement had only a few or even no bearing jewels. The Junghans J80 in the version shown here makes no exception, only the balance wheel is ruby beared, the others run in brass bearings.
The gear train construction is typical for the time being: The mainspring barrel drives the center minute wheel, followed by third wheel, seconds wheel at 6 o’clock and steel escape wheel.
The Junghans J80 has got a non shock protected screw balance, which beats with the usual 18000 A/h and drives a conventional pallet lever escapement of swiss type.
The fine adjustment is done with a long regulator arm with scale.
On the dial side, the caliber 80 uses already a yoke winding system.
At 6 o’clock, you see the brass bearing of the decentral second hand.
|Number of jewels:||7|
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:||2 hole(s)|
|Functions:||hour, minute, decentral second|
|Size:||10 1/2''' (measured: 23,0mm)|
|Production period:||1931 - 1949|
Werksucher: Jakob 1942 13|