Certina 23-35-770, Mainspring

• CERTINA original mainspring in sealed factory packaging.

• Fits cal: 23-35
  

Data Certina caliber: 23-35

• 17 jewels, manual wind, sweep second.
• S: = 10.5''' 23.30 mm.
• H: = 4.25 mm.
• N: = 18.000 A/h.
• Power reserve: 38 h.
• Mainspring: 1.30 x 9 - 0.095 - 310

Versions:

• 23-20: 18.000 A/h, sub second.
• 23-30: 19.800 A/h, sub second.
• 23-35: 18.000 A/h, center second.
• 23-36: 19.800 A/h, center second.