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Jaeger-LeCoultre Duomètre à Quantième Lunaire Luxury Watch Review The Jaeger-LeCoultre Duometre a Quantieme Lunaire is the second installment in the JLC Duometre family that took the watch world by storm in 2007. A single watch housing two parallel movements, the peerless Duometre combines high horology tech with finish worthy of a six-figure watch. Each watch in Jaeger-LeCoultre's Duometre family features two mainspring power sources, two parallel gear trains, and one regulating organ (escapement) to meter the progress both. In this fashion, neither drivetrain can slow the other, and complicated watches can run without any negative consequence to the amplitude (energy) of the balance wheel. On the Duomètre à Quantième Lunaire, JLC couples one mainspring to the escapement to provide flawless timing for 50 hours. A second mainspring actually drives the hour, minutes, seconds, flying seconds, moon phase, and date. This second spring also contains fifty hours of power. Turning the crown clockwise and counterclockwise winds each mainspring in turn, and twin dial-side power reserve indicators track the state of wind for each spring. The signature Duometre flying seconds hand or "foudroyant" jumps six times per second; both it and the center seconds hand stop and reset to zero when the crown is pulled. This permits precise synchronization to a reference time such as an atomic clock. Under the sapphire case back, the "German Silver" movement plates and bridges are crafted from a golden-hued nickel-copper alloy in the fashion of vintage pocket watches. As the original Duometre concept was inspired by a 19th century pocket watch, the movement in the Duomètre à Quantième Lunaire is crafted to resemble its forebear. All surfaces are exquisitely polished, grained, perlaged, and beveled to a standard not seen on any sub-$100K JLCs other than the flagship Duometre line. Available from with full Jaeger-LeCoultre factory boxes, papers, and accessories, this Duomètre à Quantième Lunaire is a stunning representative of the most original modern watch line to emerge from one of Swiss horology's most innovative manufactures. Video and content by Tim Mosso.