Rolex Sea-Dweller 16660

The Rolex Sea-Dweller 16660, produced from the late 1970s to the late 1980s, is a pivotal transitional model in the Sea-Dweller lineage and is often nicknamed the “Triple Six” by collectors. It marked a leap forward in professional dive watch engineering, debuting with a larger sapphire crystal, an increased depth rating of 4,000 feet (1,220 meters), and an updated helium escape valve design. The 40mm stainless steel Oyster case was paired with a unidirectional rotating bezel for enhanced diving safety, while the dial evolved from matte with painted markers to glossy with applied white gold surrounds over its production run. Powered by the upgraded Caliber 3035 with a quickset date, the 16660 combined rugged tool-watch capabilities with modern convenience. Its relatively short production run and transitional features make it a sought-after reference for Sea-Dweller enthusiasts bridging the gap between vintage charm and modern Rolex durability.

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