Certina 17-351, Third wheel, no: 210

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  NOS Certina original part in factory selaed packaging.
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  Fits cal. 17-35, 17-351, 17-36, 17-361

Versions:

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  17-35: automatic.
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  17-351: automatic, date.
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  17-36: manual wind.
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  17-361: manual wind, date.