| 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.
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