Rolex Submariner ref 5508 "Tropical" Movement Automatic cal. 1530 Case Stainless steel with screw back case, revolving calibrated bezel.37mm Dial Black lacquered, gilt inscription, with luminous hour markers and hands Features Reference 5508 was manufactured between 1958 and 1962. This Submariner model nicknamed “small crown” is the last one to carry a 100m depth rating and no crown guards. The present example is offered a beautiful dark “tropical” dial. 37 mm serial 400.xxx. 1958. Tropical dial. Case, movement and dial signed.