Certina 25-36-770, Mainspring

• CERTINA original mainspring. Not in factory packaging.
  

• Fits cal: 25-36

Data Certina caliber: 25-36

• 17 jewels, manual wind, sweep second.
• S: = 11.5''' 25.60 mm.
• H: = 4.20 mm.
• N: = 19.800 A/h.
• Power reserve: 43 h.
• Mainspring: 1.30 x 8.5 - 0.11
  

Versions:

• 25-35: 18.000 A/h, center second.
• 25-36: 19.800 A/h, center second.