Patek Philippe 12-120
The 12'' 120 calibre was originally designed with a flat hairspring and was greately modified when the Breguet hairspring was fitted into the movement. The following parts were affected by this alteration: barrel arbor, balance, click, crown wheel core, crown wheel, balance endpiece (lower), train jewels, ratchet wheel, centre wheel, canon pinion and third wheel.
Serial no´s:
-
826.892 - 829.999: Balance with screws, Diameter: 10.60 mm, Flat hairspring. -
920.000 - 920.991: Balance with screws, Diameter: 10.70 mm, Breguet hairspring. -
920.992 - 928.147: Balance with screws, Diameter: 10.85 mm, Breguet hairspring. -
928.148 - FF : Balance with screws, Diameter: 11.20 mm, Breguet hairspring. -
960.000 - 969.999: Balance with screws, Diameter: 11.20 mm, Breguet hairspring.
Data Patek Philippe cal: 12'' 120
-
18 jewels, manual wind, hour minute and sub second display. -
S: = 26.75 mm. -
H: = 4.00 mm. -
N: = 18.000 A/h. -
Power reserve: -
Mainspring: Height: 1.42 mm, Length: 363 mm, Thickness: 0113 mm.
Versions:
-
12'' SC: Sweep second. No´s: 861-704 - 864.271. Based on 12'' 120, most parts incommon.