Hand-winding Calibre J330

Type: round movement
Frequency: 4 Hz (28,800 vibrations per hour)
Diameter: 28.4 mm (12.5 lines)
Height: 4 mm
Adjustment: screws for adjusting, Erhard Junghans precision stud adjustment 
Winding: hand-winding
Power reserve: > 48 hours
Display: hours, minutes, seconds
Finishing: hand-engraved balance bridge, fan-shaped finish on wheel bridge und calibre bridge, sunray-brushed crown wheel and ratched wheel, angled edges, screwed gold chatons, blued screws, base plate with perlage
Jewels: 20
Specifics: balance with screws for adjusting and blue hairspring with Breguet overcoil, Chronometer