Rolex MK4 Sea-Dweller, ref. 1665

Additional images


Year of issue: 1977

Reference number: 1665

Serial number: 5,20X,XXX

Condition: worn

Status: sold

Dealer country: United States

Price in US $: n/a

Watch details

Brand: Rolex Model: Sea-Dweller, ref. 1665 Serial: 5,20X,XXX Dial: Black Case Size: 40mm Case Thickness: 17mm Bracelet Material: Steel Case Material: Steel Bezel Material: Steel Movement: Automatic Function: Time, Date


Justin Gruenberg


1967 saw the launch of the Oyster Perpetual Sea-Dweller, waterproof to a depth of 610 metres. To meet the needs of professional deep-sea divers, the case was equipped with a helium escape valve so that, during long decompression phases in hyperbaric chambers, the helium from the gas mixtures used could be released without risking damage to the watch. Learn more about the first Seadweller from my RPReport by following this link...

SEA-DWELLER 4000 - 1978

Rolex launched the Sea-Dweller 4000, waterproof to a depth of 1,220 metres (4,000 feet).