Seamaster Diver 300M | 43.50 mm | AutomaticSince 1993, the Seamaster Professional Diver 300M has enjoyed a legendary following. OMEGA's 21st century models stay true to the original s dive watch design, while introducing exciting new materials and movements. This 43. 50 mm model, cased in black ceramic [ZrO2] and Sedna gold, has a black ceramic dial with laser ablated waves in positive relief. The polished Sedna gold indexes and facetted hands, filled with white Super LumiNova, contrast