Yacht-Master model was first introduced back in 1950s. The model is designed to bring elegance to the classic diver's watch; its sculpted cases and sparkling dials appeal to the passionate sailor. All Yacht-Masters have a screw down, trip-lock crown and a sapphire crystal designed to be scratch resistant. Bi directional rotatable 60-minute graduated bezel with matt black Cerachrom insert in ceramic, polished raised numerals and graduations