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The Jaeger-LeCoultre Caliber 920
First introduced in 1967, the ultra-slim
automatic movement was never used by Jeager-LeCoultre but
used in the Patek Philippe (caliber 28-255 C), the Vacheron Constantin (Caliber 1120) and
the Audemars
Piquet (caliber 2120).
Audemars Piquet Caliber 2120
Vacheron Constantin caliber 1120
Vacheron Constantin caliber 1120 : With the rotor removed
Patek Philippe Caliber 28-255 C
This is a exquisite movement because it
combines both the Patek Philippe's and Jeager-LeCoultre's designs.
The raw movement is made by Jeager-LeCoultre with their famous "switching
rocker" mechanism while the
balance wheel is derived from Patek Philippe (Giromax and the free sprung regulator
with Kif-Ultraflex shock
resistance). The movement as pictured above has a centrally mounted
rotor with 21 karta gold ring and outer
ring, supported by four peripheral ruby rollers (at 1,4,7 and 10)
winding in both directions via the swtiching
rocker.
