Ballon Bleu de Cartier watch, 40 mm, mechanical movement with automatic winding, calibre 1847 MC. Rose gold 750/1000 case, fluted crown set with a blue sapphire cabochon, silvered guilloché dial, blued-steel sword-shaped hands, sapphire crystal, interchangeable brown alligator-skin strap, interchangeable rose gold 750/1000 folding buckle, calendar aperture at 3 o’clock. Thickness: 12.4 mm. Water-resistant to 3 bar (approx. 30 metres).