Engineered for the Deep The Rolex Deepsea is a professional-grade dive watch engineered for saturation diving and extreme underwater missions. With its helium escape valve and Ringlock System, it is built to withstand the most demanding environments. Maximum Strength This 2013 Rolex Certified Pre-Owned Deepsea, reference 116660, features a 44mm Oystersteel case, 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 or diving suit.