Patek Philippe 13.5-320, Winding stem, no: 401

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  NOS Patek Philippe genuine part.

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  Thread: 90

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  Fits cal: 13.5-320, 13.5-320PM

Data Patek Philippe cal: 13.5-320

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  20 jewels, manual wind, hour and minute display.
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  S: = 13.5 mm.
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  H: = 3.20 mm.
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  N: = 21.600 A/h.
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  Power reserve:
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  Mainspring: Height: 1.20 mm, Length: 155 mm.