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.