Rolex Sea-Dweller 4000ft 126600Overview The 126600 sits at the logical midpoint between the Submariner and the Deep Sea 1,220 metres of water resistance versus 300m and 3,900m respectively. It retains the Submariner's visual language but adds the Helium Escape Valve, the triplock crown, and a 43mm case that reads as a larger, more purposeful iteration of the same design brief. The case is 43mm Oystersteel with a black unidirectional Cerachrom bezel, a Cyclops date magnifier, and