Certina 13-20-415, Ratchet wheel

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  CERTINA original part in factory packaging.

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  Comes with screw: 5415

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  Fits cal: 13-20, 13-21, 13-22

Versions:

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  13-20: 19.800 A/h.
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  13-21: 19.800 A/h, threads for case clamps.
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  13-22: 21.600 A/h, threads for case clamps.