Audemars Piguet Calibre 2121
Base movement thickness [mm] : 3.05
Movement thickness with module [mm] : ---
Total diameter [mm] : 28.40
Total diameter [lignes] : 12 2/4
Casing diameter [mm] : 28.00
Casing diameter [lignes] : 12 2/4
Type of balance Variable inertia
Cadence of the balance [vibrations/hour] : 19'800
Frequency [Hz] : 2.75
Type of balance-spring stud-holder : Mobile
Spiral : Flat
Balance-stop device : ---
Direction of automatic winding : Unidirectional
Type of oscillating weight : 21-carat gold segment
Power reserve [hours] : 40
Number of jewels : 36
Shock-absorbing system : Kif Elastor
Angle of lift [°] : 54°
Number of parts : 254
Special feature 1 : Suspended barrel
Special feature 2 : Oscillating weight and segment screwed to a ball-bearing mechanism
Special feature 3 : Oscillating weight ball-bearing mechanism running on four ruby rollers
Date, automatic winding.
AP2121, derrived from the caliber 920 of Jaeger-LeCoultre. This is the movement that Audemars Piguet still uses today for their Royal Oak 'Jumbo' and they are the only ones who actually are allowed to use it (it has been licensed).
PP 324SC
The self-winding caliber 324 S C movement runs at a frequency of 4Hertz (28,800 semi-oscillations per hour).
This assures high rate accuracy and an extremely constant amplitude of the balance.
Date
Center sweep second hand
Overall diameter: 27 mm
Height: 3.3 mm
29 jewels, 6 bridges
Balance: Gyromax
Vibrations per hour: 28'800
Power reserve: 45h max.
Number of parts: 213
