Doxa watch sub 4000t professional sapphire bezel 635189692885 for the first time in the history of the doxa sub the original design of the 1960s has been modernized with an entirely new case design with more rounded edges and an ergonomic shape the new asymmetrical case shape acts as its own crown protector offering a domed sapphire crystal and curved bezel forming one continuous convex surface an entirely new design yet unmistakably doxa