Built for the Deep The Sea-Dweller is a professional-grade dive watch engineered for saturation diving and extended underwater missions. Introduced in 1967, it features a helium escape valve and exceptional water resistance, making it a true tool watch for deep-sea explorers. Classic Tool Watch This Rolex Certified Pre-Owned Sea-Dweller, reference 16600, features a 40mm Oystersteel case, black dial and rotatable 60-minute bezel. Powered by the calibre 3135 automatic movement, it offers a 48-hour power reserve. The Easylink Oysterlock clasp ensures secure wear, while the robust build makes it ideal for demanding environments.