The silver-toned dial of the Chopard L.U.C Lunar Big Date has some distinctive peculiarities which makes it very recognizable: an original view of the moon phases showing both Northern and Southern hemispheres, a large date display with two apertures at 12 o'clock, the small seconds indication between 4 and 5 o’clock, the pointer-shaped hands emphasising the idea of precision, and large applied Roman numerals.
The moon phase complication of this movement is so accurate that the difference between the actual lunar cycle and its indication is just one day every 122 years. To accurately reproduce the interval between two identical moon phases – known as a synodical revolution and equivalent to 29 days, 12 hours, 44 minutes and 2.8 seconds - the wheel which drives the moon-bearing disc comprises 135 teeth.
The 42 mm case, in polished white gold except for the satin-brushed case-band, houses the COSC-certified self-winding L.U.C Calibre 96.20-L. The movement, visible through the exhibition case-back, features two stacked co-axial barrels ensuring a 65-hour power reserve to the balance oscillating at a rate of 28,800 vibrations per hour.
The Chopard L.U.C Lunar Big Date (ref. 161969-1001) is fitted with a hand-sewn black alligator leather strap secured by a white gold folding clasp and has a list price of Euro 24,490.