This watch is accompanied by a Rolex Garantie dated 21 Nov 1980.
The Sea Dweller reference 1665 was the first diver's watch with a Rolex patent valve in the band and guaranteed waterproof to depths of 2000 feet. The valve was first developed on the Submariner model to allow helium and other gases to escape, enabling the watch to withstand compression.
The present lot is one of the first Sea Dweller models as it features Sea-Dweller Submariner 2000 in red print on the dial.
An example of reference 1665 is illustrated in The Best of Time - Rolex Wristwatches by James M. Dowling & Jeffery P. Hess, p. 269.