|Actual Caliber||ETA 7750|
|Movement Type||Automatic, self-winding mechanical|
|Beat Rate||28,800 (4Hz)|
|Lift Angle||49 degrees|
|Power Reserve||48 hours|
|Rotor Style||Ball bearing system|
|Anti-Shock Device||Incabloc or Nivachoc|
|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|
|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.