Certina 19.25-770, Mainspring

CERTINA original mainspring in factory packaging.

• Fits cal: 19.25, 19.251, 19.26

Versions:

• 19-25:   manual wind, 18.000 A/h.
• 19-251: manual wind, 18.000 A/h, date.
• 19-26:   manual wind, 18.000 A/h.
• 19-35:   manual wind, 19.800 A/h.
• 19-351: manual wind, 19.800 A/h, date.
• 19-36:   manual wind, 19.800 A/h, modifications.
• 19-45:   automatic wind, 18.000 A/h.
• 19-451: automatic wind, 18.000 A/h, date.
• 19-55:   automatic wind, 19.800 A/h.
• 19-551: automatic wind, 19.800 A/h, date.