The newest addition to the Rolex Sea-Dweller Deepsea line is the ref. 126660. The Deepsea is well-known for its impressive depth rating of up to 3,900 meters or 12,800 feet, a resistance that is achieved via the addition of a Helium Escape Valve, a thicker 5mm sapphire crystal, and an innovative Ring Lock system. While most collectors will never need to travel to such depths, the sheer technical prowess involved to create such an incredible depth rating is enough to win over even the most sophisticated luxury watch collectors. A larger 44mm Oyster case accommodates the incredible depth rating and is worn on a matching flat-link Oyster bracelet secured by a tool-free Glidelock extension system. The pre-owned Rolex 126660 also utilizes an improved Chromalight luminous material as well as a Cerachrom bezel insert crafted from resilient ceramic material.