Patek Philippe 12-400, 27-AM 400, Mainspring, no: 770

• 
  New Patek Philippe genuine part in factory sealed 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.