Junghans J80/12; Junghans 680.75

Caliber Junghans J80/12; Junghans 680.75

Automatic; Power Reserve Indicator


Junghans J80/12; Junghans 680.75; Front


Junghans J80/12; Junghans 680.75; movement


Junghans J80/12; Junghans 680.75; movement


Junghans J80/12; Junghans 680.75; back

  • Type: men´s wristwatch
  • Manufacturer on dial: Junghans
  • Trademarks/imprint: JUNGHANS AUTOMATIC 22 JEWELS; Back: STAINLESS STEEL BACK SHOCK & WATERPROOF; J in eight-pointed star
  • Number of jewels: 22
  • Escapement: lever escapement
  • Balance staff: two-leg screw balance; scuttled screws
  • Shock protection: Junghans II
  • Particularity: Automatic; Power Reserve Indicator
  • Beats per hour: 18.000 A/h
  • Dimensions of movement: 10.5”’, corresponds to 23,3 mm, mit Guide ring for Automaticrotor: 29,8 mm; height 7 mm
  • Period of production: 1951 – 1953
  • Functions: automatic, power reserve indication
  • Display: hour, minute, sweep second, power reserve indication (at 6)
  • Dial: outer circle: cream; gilded Roman numerals (XII, III, VI, XI); gilded wedge indexes; inner circle: silver plated; radium dots; 12 luminous triangle; black minute lines, printed
  • Hands: Sword with luminous
  • Second hand: red; thread with counterweight
  • Case shape: round
  • Case diameter (mm): 35 mm
  • Case material: Brass, chromed; Support material with visible parts
  • Back: Steel, screwed
  • Bracelet/strap: no



Junghans J80/12; Junghans 680.75; movement


Junghans J80/12; Junghans 680.75; movement dialside

The Junghans J80 / 12 was the first German movement with power reserve indicator. During this time, some customers did not trust the automatic winding, therefore Junghans decided to solve this problem with a display of the power reserve. With this watch to Junghans ventured into the field of automatic watches.


Junghans J80/12; Junghans 680.75; Gangreservenanzeige zeigt leichten Aufzug


Junghans J80/12; Junghans 680.75; Unruh; balance wheel


Junghans J80/12; Junghans 680.75; Werk; movement


Junghans J80/12; Junghans 680.75; Werk; movement

Anders als bei den herkömmlichen Junghans J80 verwendete man eine autokompensierende Flachspirale und eine Spezial-Nickel-Unruh, deren Ausgleichsschrauben im Reif versenkt sind. Die Entwickler ließen sich das Differential-Getriebe zur Ermittlung der Gangreserve patentieren, der Rotor besitzt einen Schwermetallreif, der beidseitig über einen Wippen-Wechsler  bis zu einer Gangreserve von 40 h aufzieht.

Variant with black dial


Junghans J80/12; Junghans 680.75; Front


Junghans J80/12; Junghans 680.75; Front

Here is an example for the version with a black dial.

In the archiv of the Workshop you can find the revision of a Junghans J80/12 with the black dial.

Hour and minute hands are questionable original. It already is, however, the second watch that I see with exact that hand variant. Maybe the watch was but delivered from the factory that way.

Caliber overview


Caliber classification Junghans J80, Junghans J81

Again, I find it difficult in some caliber allocation. With the above list I tried to provide some clarity on the different caliber and their designations.

The movements were produced at the same time with or without divided wheel bridge. There are versions with 7, 11, 13, 15, 16 and 17 jewels.

There's caliber Junghans J80 with various imprints on the bridge: J80S; J80M (was probably Meister).