Omega first introduced the seamaster 300 in 1957 it was a watch designed especially for divers and professionals who worked underwaterthis seamaster 300 has a sand blasted black dial with 18k sedna gold hands coated with vintage super luminova the 18k sedna gold bezel has a ceragold ring and diving scale the 41 mm stainless steel case is presented on a stainless steel and 18k sedna gold bracelet a transparent caseback makes it possible to see the anti magnetic omega master co axial