Rolex Sea-Dweller ref. 1665 Mark 1 Patent Pending

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Year of issue:

Reference number: 1665

Serial number:

Condition: hardly worn

Status: available

Dealer country: Italy

Price in EUR €: On request

Watch details

Rolex Sea-Dweller in steel Mark 1 Patent PendingReference 1665Serial 1.71x.xxxDouble red turnt pink script mark 1 dial, super rare Patent Pending case: this model is one of the first 150 produced to test the application of the elium valve for military useSelf-winding mechanics caliber 1570Price on request


Elvio Piva


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).