Cartier - Ballon Bleu de Cartier watch - Watch Gold - Ballon Bleu de Cartier watch, 36 mm, mechanical movement with automatic winding. 18K yellow gold case and fluted crown set with a cabochon sapphire. Silver guilloché dial. Blued-steel sword-shaped hands. Sapphire crystal. 18K yellow gold interchangeable bracelet. Case thickness: 12.1 mm. Water-resistant up to 3 bar (approx. 30 meters/100 feet).