Launched in 1967, the celebrated Sea-Dweller reference 1665 was the first wristwatch designed for use in saturation diving, fitted with a Rolex patent valve in the band and guaranteed waterproof to 610 meters depth. The valve was first developed on the Submariner model and allows helium and other gases to escape, enabling the watch to stand compression.
The present watch is from the fourth, so-called "Mark III" or "Mk 3" series of the "double red" Sea-Dweller, in production between around 1970 to 1973, and distinguished by the printing on its dial.
The "double red" designation is written directly on the dial and often darker and less intense than on the "Mk 2" for example. The two double red lines show different sizes: the second line, "SUBMARINER 2000", is smaller than the first line "SEA-DWELLER". The 5 tips and the oval at the base of the Rolex crown are clearly defined. The overall impression of the fonts is thinner and less distinct than on the earlier versions.
Consigned by its first owner, the present watch stands out by its highly appealing, original overall condition.