Extreme Depths The Rolex Deepsea is engineered for the most demanding underwater environments. As part of the Sea-Dweller family, it features the patented Ringlock System, allowing it to withstand extreme pressure while maintaining Rolexs signature precision and durability. A professional-grade tool watch built for the deep. Robust Capability This 2012 reference 116660 features a 44mm Oystersteel case and a black dial with Chromalight display for enhanced legibility. The unidirectional bezel includes a 60-minute scale for dive timing. Powered by the calibre 3135 automatic movement, it offers a 48-hour power reserve. The Oyster bracelet includes Fliplock and Glidelock extension systems for secure and adjustable wear.