Certina 19.30-770, Mainspring

• CERTINA original mainspring in factory sealed packaging.
  

• Fits cal: 19.30, 19.31, 19.35, 19.351
  

Versions: 18.000 A/h.

• 19-25:    manual wind, sweep second.
• 19-251:  manual wind, sweep second, date.
• 19-26:    manual wind, sweep second, modified barrel.
• 19-30:    manual wind, sub second.
• 19-31:    manual wind, sub second, plate without mounting flanges.

Versions: 19.800 A/h.

• 19-35:    manual wind, sweep second.
  
• 19-351:  manual wind, sweep second, date.
• 19-36:    manual wind, sweep second, modified barrel.