Chronometer-certified by the COSC, the mechanical self-winding L.U.C Caliber 96.12-L beating at a frequency of 28,800 vibrations per hour (4Hz), boasts a 65-hour power reserve thanks to the Twin technology, a Chopard-patented system combining two coaxial barrels and representing a truly remarkable technical feat in light of the extreme slenderness of the 3.3 mm-thick movement.