The alpina seastrong diver 300 with a rubber strap is providing perfect readability for professional divers in vibrant orange for optimal dial and bezel visibility it is an automatic with a screw down case back and screw in crown for a water resistant controlled environment 300m bright white luminous hands bearing the signature alpina triangle against a contrasting black background boast out of its anti reflective sapphire glass screen 44mm wide the seastrong diver 300 has a jet black uni