41.5mm case in 18K white gold with a thickness of 8.1mm, transparent sapphire crystal caseback, screw-down crown, antimagnetic, entirely skeletonized sapphire crystal dial with a blue minutes track and blue calendar counters, moon phase with a star-studded sky and two polished moons in 18-carat gold, Vacheron Constantin calibre 1120 QPSQ/1 ultra-thin self-winding skeleton movement, 4.05mm thick with a gray NAC-coated finish, 276 parts and 36 jewels, operating at 19800 vibrations per hour (2.75 Hz), hours, minutes and perpetual calendar with hand-type day of the week, hand-type month and hand-type date, moon phase and 48-month counter with leap year indication, accurate until the year 2100, approximately 40 hours of power reserve, polished and satin-finished 18K white gold bracelet, supplied with two additional interchangeable straps in dark blue Mississippiensis alligator leather and dark blue rubber, each with an 18K white gold ardillon buckle, water-resistant to 5 bar (50 metres / 165 feet), Hallmark of Geneva certified.