Depthmaster HeritageSwiss Automatic Depthmaster Heritage Case Size: 42mm A screw down stainless steel exhibition caseback showcases the intricate, inner workings of the watch. The genuine leather strap is equipped with a tang buckle. Sturhlings signature wings logo on the buckle is for guaranteed style, of course. A unidirectional rotating bezel and luminous markers are there to ensure divers safety and to help them keep track of the time no matter day or night.