The Rolex Sea Dweller 16660, widely recognized by collectors as the Triple Six, marked a major technical evolution within the Sea Dweller lineage. It introduced several important upgrades over earlier references, including sapphire crystal construction, increased depth rating, and a more advanced movement platform. These changes positioned the watch as a bridge between vintage Rolex dive watches and the more modern professional references that followed in later decades.

The reference is especially admired for its strong vintage character combined with improved durability and functionality. Early matte dial examples remain highly collectible, while later glossy dial variations introduced a more contemporary visual style. Powered by the Rolex Calibre 3035 automatic movement, the 16660 continues to hold an important place among serious Rolex collectors due to its historical significance and distinctive transitional identity.