Junghans Caliber J880.1

Brand	Junghans
Caliber Number	J880.1
Actual Caliber	ETA 7750
Movement Type	Automatic, self-winding mechanical
Lignes	13.25”’
Diameter	30mm
Height	7.9mm
Jewels	25
Beat Rate	28,800 (4Hz)
Lift Angle	49 degrees
Power Reserve	48 hours
Rotor Style	Ball bearing system
Rotor Winding	Uni-Directional
Hand-Windable?	Yes
Anti-Shock Device	Incabloc or Nivachoc
Balance Spring	Nivarox
Hand Count	6
Functions	Central hours; central minutes; central chronograph seconds; small running seconds subdial at 9:00; 30 minutes chronograph counter at 12:00; 12 hour chronograph counter at 6:00; day/date at 3:00
Hacking Seconds?	Yes
Country of Manufacture	Switzerland, Swiss made
Known Models	Junghans Meister Chronoscope (ref: 027/4528.45, 027/4526.01, 027/7023.03, 027/7024.02, 027/7024.03) (Add your watch to the comments below…)

The Junghans caliber J880.1 is a Swiss made automatic chronograph movement found in the Meister Chronoscope line of watches. This caliber is basically an ETA/Valjoux 7750 with a branded rotor.

J880.1 VS J880.2:

There is a similar caliber J880.2 found in the Max Bill Chronoscope series. The J880.1 and J880.2 are both based on the 7750, but the J880.1 is a tricompax layout with a small seconds subdial at 9:00. The J880.2 has a vertical bi-compax layout with no small seconds at 9:00. Some J880.2 have a date only without the day of the week.

Additional Resources:

• Junghans official user manual (pdf)