In 1967, Rolex created the first Sea-Dweller reference 1665, which was the world’s most robust diver's watch, able to withstand pressures at a depth of 2000 feet, or 610 meters, below sea-level.

The evolution of the model created several variations of the “Double Red” Sea-Dweller text on the dial, with earlier versions being especially desirable for collectors. The present watch is fitted with a Mark II dial - the successor to the so-called Mark I, as the font used for the word “Submariner” is slightly smaller than the word “2000”. The nickname “Double Red” is a result of the first two lines of text reading “Sea-Dweller” and “Submariner 2000” written in red.

The caseback not only has the reference number stamped inside, but also has the last three digits of the case’s serial number right above it. The hour markers have aged to a pleasing caramel color that contrasts beautifully against the black matte dial. This example was made in 1972 and remains in excellent condition. “Double Red” Sea Dwellers, especially those fitted with these early dials, are highly sought after vintage Rolex sport models.