Patek Philippe 12-400, 27-AM 400, Crown wheel, no: 420

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  New Patek Philippe genuine part, not in original packaging.

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  Fits cal: 12'' 400, 27-AM 400, 27-HS 400

Data: Patek Philippe 12''400 / 27-AM 400. This caliber is a transformation of calibre 12''400, the regulating system have been changed for more accuracy and made anti magnetic.

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  18 jewels, manual wind, hour, minute and sub second display.
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  S: = 26.75 mm.
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  H: = 4.00 mm.
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  N: = 19.800 A/h.
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  Power reserve:
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  Mainspring: height: 1.42 mm, Length: 355 mm, Thickness: 0.115 mm.

Versions:

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  12'' 400: N: = 18.000 A/h, all parts from 27AM-400 exept from the regulating system,

the fourth wheel and the escape wheel are identical.

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  27-AM 400 N: = 19.800 A/h.
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  27-HS 400 N: = 19.800 A/h, jumping hours.