Patek Philippe 12-400, 27-AM 400, Spring for yoke, no: 440

• New Patek Philippe genuine part, not in original packaging.

• 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.

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

Versions:

• 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.

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