41.5mm 18K 5N pink gold case with a thickness of just 8.1mm housing an entirely skeletonized ultra-thin perpetual calendar, antimagnetic construction, transparent sapphire crystal caseback, sapphire dial with blue velvet-finished minutes track, blue counters and 18K gold moons on a starry sky, 18K gold applied hour and minute hands and hour markers highlighted with blue SuperLuminova, Vacheron Constantin calibre 1120/3 QPSQN/1 ultra-thin self-winding skeleton movement with 276 parts and 36 jewels, hours, minutes and perpetual calendar with hand-type day, date and month, 48-month leap year counter and moon phase, accurate until the year 2100, operating at 19800 vibrations per hour with approximately 40 hours of power reserve, polished and satin-finished 18K pink gold bracelet with triple folding clasp, supplied with additional dark blue grained calfskin leather and dark blue rubber straps with ardillon buckle. Water resistant to 50 metres / 165 feet. Hallmark of Geneva certified.