The True Moon timepiece features the world's first mechanism capable of providing a realistic view of the phases of the moon as we see them in the northern hemisphere with a deviation of just one day in 125 years. This unprecedented feat was achieved by using the synodic month of 29 days, 12 hours and 44 minutes - the time between successive recurrences of the same phase - as a basis for calculation.
Functions Hours, minutes, centre seconds, perpetual moon phase at 6 o'clock, date display at 3 o'clock
Caliber A1788 Exclusive Arnold & Son mechanical movement, self-winding, 21 jewels, diameter 38.6 mm, thickness 7.47 mm, power reserve 42 h, 28'800 vibrations /h, perpetual moon cycle at 6 o'clock. Movement Decoration: rhodium treated with fine circular graining and 'Côtes de Genève'.
Case Stainless Steel, diameter 46mm, cambered sapphire with anti-reflective coating on both sides, case back metallic sapphire
Dial Blue dial. Engraved earth at 12 o'clock. 19 diamonds, yellow stars. Rhodiated indexes, polished. Rhodiated facetted hands, polished.
