In 1978, the original Sea-Dweller (Reference 1665) was replaced by the Reference 16600. This new model boasted an even greater depth rating: an impressive 4000 feet (or 1220 meters). This was possible, in part, due to a larger Helium Escape Valve.

Visually, the 16600 stands apart from its predecessor with a glossy dial featuring applied luminous markers. The internals were also upgraded with the Calibre 3035 movement. Rugged, dependable, and beautiful the Reference 16600 is the last 'Dweller with classic Oyster dimensions.

This particular example, an A-serial, dates to circa 1999 and features an outstanding untouched 'holey lug' case with a helium escape valve, a rich glossy black "Swiss Only" Luminova dial and matching handset, and a matching Oyster bracelet with solid ends. Furthermore, this watch retains its factory caseback sticker.

This is a rugged, beautiful, and highly functional watch from the last era of classically proportioned Rolex sports watches.