Rotonde de Cartier Astromystérieux watch, 43.5 mm, Manufacture mechanical movement with manual winding, caliber 9462 MC. Case in 950‰ palladium, beaded crown in 950‰ palladium set with a blue sapphire cabochon, guilloché dial, apple-shaped hands. Strap in black alligator skin, double adjustable folding buckle in 18K white gold. Astromystérieux complication: mysterious central tourbillon, consisting of the escapement, balance, main geartrain and barrel, and completing one full revolution in one hour. Individually numbered movement consisting of 408 parts including 188 ball-bearings and 25 jewels. Movement diameter: 39 mm, movement thickness: 5.9 mm, balance: 21,600 vibrations/hour, power reserve approx. 50 hours. Sapphire crystal and case back. Case thickness: 12 mm. Water-resistant to 3 bar (approx. 30 meters/100 feet).