Rolex Submariner 114060 Black Dial Apr 2015,Christie’s This successor on the ref. 1680 is the next-generation Submariner Day. It had been the very first Sub Day being Outfitted with a sapphire crystal along with a unidirectional rotating bezel, as well as a 300m depth ranking. The then-new Cal.Unidirectional bezel that enables a diver to memorize