Launched in 1967, the Sea-Dweller reference 1665 was the first Rolex wristwatch designed for use in saturation diving. It featured a Rolex patent valve in the band, first developed on the Submariner model, to allow helium and other gases to escape, which would enable the watch to stand compression at deep depths.

A rare example of the reference, the timepiece is part of an important private collection and is bestowed with the exclusive Tiffany & Co. retailer signature. A prestigious and rare trait to be seen on scarce references of the Swiss manufacture, the wristwatch represents an uncommon sighting at auction. With clean and attractive black dial allied to a well preserved stainless steel case of strong proportions, the timepiece astounds the avid collector through its overall appeal. The timepiece further more distinguishes itself through its Mark 2 dial with the “Superlative Chronometer Officially Certified” text written asymmetrically on the vertical axis and referred to as “Rail Dial” by collectors. Usually found on examples produced between 1977 and 1979, the timepiece can be considered as part of the last examples of the reference to feature such dial configuration.