Certina 17.25-770, Mainspring

• CERTINA original part in very good used condition
  

• Fits cal: 17.25, 17.251

Technical data Certina cal: 17-25

• 17 jewels, manual wind, sweep second.
• S: = 7.75''' 17.2 mm.
• H: = 3.7 mm.
• N: = 19.800 A/h.
• Power reserve: 44 h.

Versions:

• 17-25:
• 17-251: date.