The selfwinding Rolex Sea-Dweller Deepsea is among the ultra-resistant divers’ watches engineered by Rolex for deep-sea exploration. The 44 mm case in Oystersteel with its monobloc middle case, screw-down case back and winding crown. Rolex Ringlock System case architecture with Helium escape valve. Unidirectional rotatable 60-minute graduated, scratch-resistant Cerachrom insert in ceramic, numerals and graduations coated in platinum. The black dial with highly legible Chromalight display with long-lasting blue luminescence, domed, 5.5 mm-thick scratch-resistant sapphire. Complimented by an Oystersteel bracelet with its three piece links, secured with a folding Oysterlock safety clasp with Rolex Glidelock extension system. The power behind the Sea-Dweller Deepsea is the Calibre 3235, Manufacture Rolex and offers functions that include centre hour, minute and seconds hands, instantaneous date with rapid setting, stop-seconds for precise time setting and a power reserve of approximately 70 hours and waterproof to 3,900 metres / 12,800 feet, helium escape valve m.