Seiko Prospex Marinemaster 1965 Heritage Diver'S Watch SJE101Prospex Marinemaster 1965 Heritage Diver's Watch. Distinguished by its blend of functionality and aesthetics, this extraordinary timepiece, part of the first globally launched watch series to bear the Marinemaster name, features the first see through screwdown caseback on a Seiko divers watch, as well as an elegantly chamfered case and bezel and a flexible double curved bracelet for a comfortable fit. Based largely on Seikos 1965 divers watch, the