Rotonde de Cartier watch
Rotonde de Cartier Astromystérieux watch, 43.5 mm, Manufacture mechanical movement with manual winding, calibre 9462 MC. 18K rose gold case, 18K rose gold beaded crown set with a blue sapphire cabochon, guilloché dial, apple-shaped hands. Black alligator-skin strap, 18K rose gold double adjustable folding buckle. 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. 55 hours. Sapphire crystal and case back. Case thickness: 12 mm. Water-resistant to 3 bar (approx. 30 metres).