Look up "Underrated" in the Horological Dictionary and there should probably be a picture of the JLC Duometre. The absolutely incredible Duometre utilizes a Dual Wing concept whereby the time telling is one independent train and the chronograph is on another, but come together to perform through one escapement and balance.
Dial side, all hands relating to the monopusher chronograph are found in blue. Seconds are measured on the central axis while a 1/6th of a second Foudroyante exists on the 6 o'clock subdial. At the 3 o'clock subdial two hands are stacked on top of each other, the top measuring elapsed minutes and below is for elapsed hours. Furthermore, a rotating disc is placed at the bottom of the subdial to give an additional readout of the elapsed minutes (because, why not)!!! Then, tucked down at the 4 o'clock position is a power reserve indicator specifically for the chronograph. Rose gold hands give the readout of the time, and the power reserve relating to the time is at 8 o'clock.
Movement side you will see two barrels, each with my favorite "Passenger clicks". Winding the crown clockwise will animate both barrels in opposite directions. Clockwise winding powers the Time train, counterclockwise winding again animates both barrels but will only power the Chronograph train. Each barrel is good for 50 hours reserve for their respective train and since the chronograph and time keeping are separate, there is no amplitude drop or reduction of accuracy of the time when the chronograph is in motion. Unlike most JLC, much of the componentry is hand finished.
42mm x 13.9mm x 50.3mm lug to lug.
Reference Q6012420 - Complete w/ Box and undated Warranty Card.
