Junghans J80 (680.70)

 
Junghans J80 (680.70)

Junghans J80 (680.70)

Description

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.

base plate

base plate

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.

gear train

gear train

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.

side view of the gear train

side view of the gear train

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.

Junghans J80: Dial side

Junghans J80: Dial side

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.

Technical data

Manufacturer:Junghans
Caliber:J80
Number of jewels:7
Escapement:Pallet lever
Balance types: Nickel screw balance
Shock protection(s): none
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:s
Functions:hour, minute, decentral second
A/h:18000
Size:10 1/2''' (measured: 23,0mm)
Production period:1931 - 1949
Literature: Werksucher: Jakob 1942 13
Inventory number:19013

Usage gallery

Junghans gents watch (case missing)

Junghans gents watch (case missing)

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