Tudor Black Bay, Stainless-Steel GMT Pepsi Bezel Diver 41MM Watch 79830RBDESCRIPTION At Baselworld 2018, Tudor created a veritable buzz when they introduced a GMT function to their famed Black Bay diver. The 79830RB comes in a polished and satin finished steel case that is 41mm in diameter with a screw down winding crown, a domed sapphire crystal and a solid case back. It has a steel bidirectional bezel with a matte blue and red aluminum disc insert which features 24 hour graduations. It comes with a black dial with index