Engineered for the Extreme 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. Strength and Precision Combined This 2020 Rolex Certified Pre-Owned Deepsea, reference 126660, features a black dial, rotatable bezel and a 44mm Oystersteel case. The Fliplock Oysterlock clasp with Glidelock extension ensures a secure fit over a wetsuit, while the calibre 3235 movement offers a 70-hour power reserve.