Eterna caliber 3505
A half-century after the Eterna Movement Matic, with its historic combining of the winding rotor and the ball bearing, comes another technical breakthrough from Eterna Movement. Its innovative Eterna Movement Spherodrive ball bearings seating for the barrel and barrel arbor, eliminates practically every drawback of the centuries-old system it replaces.
Calibre 3505 is a hand-wound, shaped movement.
Dimensions: 30 x 24 mm
Height: 4.1 mm
Vibrations per hour: 28’800 v.p.h
Power reserve: 54 h
No. of jewels: 17
No. of ball bearings: 5