Cartier Ronde Must de Cartier 40mm Men's Leather Strap Watch WSRN0032. Stainless steel 40mm case and bezel all on a black strap (made without animal materials). Beaded crown set with cabochon-shaped spinel. This men's watch Features a sandblasted silvered dial with blued steel hands. black roman numerals and a date display at the 3 o'clock position. Water resistant up to 30m and sapphire crystal glass. Automatic movement.