Certina 17-351, Reversing wheel, no: 1520/1

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  NOS Certina original part in factory sealed packaging.
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  Fits cal: 17-35, 17-351

Versions:

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