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Rectangular hand-winding proprietary movement

A half-century after the Eterna Matic, its historic mating of the winding rotor and the ball bearing, comes another technical breakthrough from Eterna. Its innovative Eterna Spherodrive ball bearings seating fro the barrel and barrel arbor eliminateds practically every drawback of the centuries-old system it replaces

Less friction and a lower loss of energy, which gives the movement longer longevity

In a conventional watch movement and in the Eterna 3501 calibre, one end of the barrel arbour supporting the barrel and the mainspring pivots on the base plate, and the other in a bridge. In the Eterna 3505 movement with Eterna Spherodrive, the smooth bearing for the arbour in the barrel and the two smooth bearings for the arbour in the base plate and in the bridge are replaced by an innovative lubrication-free double ball bearing mechanism.

The movement feature special decorations
Technical details

 

  • Hand-winding Eterna 3500/3501
  • Functions: h, min, s
  • Dimensions : 30 x 24 mm
  • Height :  4.1 mm
  • Lines : 13 1/4 X 10 3/4
  • Frequency 28,800 v.p.h.
  • Power reserve: 48h
  • Number of jewels : 19
  • Number of ball bearing : 2
Technical details

 

  • Calibre: Hand-winding Eterna 3505
  • Display : h, min, s
  • Dimensions : 30 x 24 mm
  • Height : 4.1 mm
  • Lines : S13 1/4 x 10 3/4 
  • Frequency 28,800 v.p.h.
  • Power reserve: 54h
  • Number of jewels: 16
  • Number of ball bearing : 5