Helvetia 830, Click spring, no 430

Used Helvetia original part in very good condition.

Fits cal: 830, 837, 838, 844, 845

Data: Helvetia cal: 830

• 
  17/21 jewel, manual wind, sweep seconds.
• 
  S: = 25.6 mm 11.5'''
• 
  H: = 4.30 mm.
• 
  N: = 18.000 A/h.
• 
  Power reserve: 45 h.

Versions:

• 
  830: Manual wind
• 
  837: Automatic winding.
• 
  838: Automatic winding, new designed rotor locking.
• 
  844: New automatic mechanism, date.
• 
  845: New automatic mechanism.