Certina 15-20-710, Pallet fork

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  CERTINA original winding stem, not in factory packaging.

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  Fits cal: 15-20

Versions:

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  15-20: 6.75''' 19.800 A/h.
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  15-21: 6.75''' 21.600 A/h.
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  17-211: 7.75''' 21.600 A/h, date.
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  17-221: 7.75''' 21.600 A/h, date, modified balance.