Rotonde de Cartier Skeleton watch, 42 mm, Manufacture mechanical movement with automatic winding, caliber 9621 MC. 18K yellow gold case, beaded crown set with an aventurine cabochon, blued-steel sword-shaped hands with luminescent material. Strap in blue alligator leather, with 18K yellow gold double adjustable folding buckle. Blue lacquer skeletonized bridges forming Roman numerals. Individually numbered movement consisting of 165 parts including 28 jewels. Movement diameter: 31 mm, movement thickness: 5.6 mm, balance: 28,800 vibrations/hour, power reserve approx. 48 hours. Sapphire crystal case back. Case thickness: 11.8 mm. Water-resistant up to 3 bar (approx. 30 meters/100 feet).