Certina 12-11, Mainspring, no: 770

• 
  New Certina original part in factory sealed packaging.

• 
  Fits cal: 12-11

Technical data Certina cal: 12-11

• 
  17 jewels, manual wind.
• 
  Size: 5.5 x 7''' 12.15 x 15.55 mm.
• 
  H: = 3.5 mm.
• 
  N: = 19.800 A/h.
• 
  Power reserve: 46 h.
• 
  Mainspring: 1.40 x 6.0 - 0.060 - 210 mm.

Versions:

• 
  12-10: 18.000 A/h.
• 
  12-11: 19.800 A/h.