Cartier Ronde Must de Cartier 36mm Leather Strap Watch WSRN0031. Stainless steel 36mm case and bezel all on a black strap (made without animal materials). Beaded crown set with cabochon-shaped spinel. This watch Features a sandblasted silvered dial with blued steel hands and black roman numerals. Water resistant up to 30m and sapphire crystal glass. Quartz movement.