Rotonde de Cartier Skeleton 42 mm watch, Manufacture self-winding mechanical movement, caliber 9621 MC. Platinum case, pearly crown set with a cabochon blue sapphire, polished steel Breguet hands. Blue alligator strap, double adjustable folding buckle in 18K white gold. Skeletonized blue lacquer bridges in the shape of Roman numerals. Movement with individual numbering, 165 parts and 28 jewels. Diameter 31 mm, thickness 5.6 mm, balance wheel at 28,800 vibrations / hour, power reserve of approximately 48 hours. Sapphire crystal and case back. Thickness 11.8 mm. Waterproof up to 30 meters.