Extreme Depth, Refined Design The Rolex Deepsea is a professional dive watch built for the most demanding underwater environments. With its helium escape valve and Ringlock System, it is engineered to withstand the immense pressures of the deep ocean. Gradient Dial, Maximum Performance This 2015 Rolex Certified Pre-Owned Deepsea, reference 116660, features a 44mm Oystersteel case, a gradient blue-to-black dial and rotatable 60-minute bezel. Powered by the calibre 3135 automatic movement, it offers a 48-hour power reserve. The Fliplock Oysterlock clasp with Glidelock extension ensures a secure fit over a wetsuit.