Ballon Bleu de Cartier watch. 40 mm. mechanical movement with automatic winding. calibre 1847 MC. 18K rose gold case set with 52 brilliant-cut diamonds totalling 1.06 carats. fluted crown set with a cabochon sapphire. silvered sunray-brushed dial. blued-steel sword-shaped hands. sapphire crystal. 18K rose gold interchangeable bracelet. calendar aperture at 3 oÕclock.