Tudor Black Bay Heritage Black Dial  Ref 79220B, 41MM, Stainless steel case with a stainless steel bracelet. Uni-directional rotating stainless steel bezel with a blue top ring. Black dial with luminous silver-tone hands and dot hour markers. Minute markers around the outer rim. Dial Type: Analog. Luminescent hands and markers. Automatic movement with a 38 hour power reserve. Scratch resistant sapphire crystal. Screw down crown. Solid case back. Case diameter: 40 mm. Round case shape. Deployment clasp. Water resistant at 200 meters / 660 feet.