In 1967 Rolex introduced the Sea-Dweller Ref. 1665, the first watch with a helium escape valve. Helium is used in saturation diving. Particles of Helium build up in the case during extended dive sessions. Divers found that the Submariner had a tendency when they were in the decompression chamber to pop the plexiglass. To solve this issue, a Helium escape valve was added to the side of the Sea-Dweller case. Rolex made at that time roughly 100 pieces; their design was similar to the Submariner ref. 5514 COMEX. The Ref. 1665 Double Red (due to the two lines of Red Text on the dial) ran from 1967-1977. It was replaced by the Ref. 1665 “Great White” (the Red Text was replaced by White Text) ran from 1977 until 1983. The Ref. 16660 “Triple Six” was one of the first Rolex to have a sapphire crystal which helped to increase its water resistance from 2000ft/610m to 4000ft/1220m. Our Rolex Sea-Dweller 16600 replaced the Ref. 16660 in 1988 until 2008.
Its 40mm Oyster case has chamfered edged lugs with a lug to lug length of 47.5mm and a thickness of 14.5mm. Polished and brushed surfaces transition with crisp lines. On the right side is a Triplock screw-down crown, a system introduced on the Sea-Dweller in 1970, it consists of three sealed zones, two gaskets within the tube and a third gasket under the winding crown. On the left side, you find the Helium escape valve flush with the case, it automatically releases the Helium when it reaches a critical point. The stainless steel unidirectional bezel has an Aluminium 60-minute dive insert. A domed sapphire crystal is 5.5mm thick, enabling it to descend to those incredible depths. A plain outer ring surrounds the matte black dial. SuperLuminova coated discs, and baton indices mark the hours. At 3 o’clock a date window, you’ll notice that there are no cyclops, the reason being that extra thick crystal. Mercedes' hands are complemented by a second hand with a lollipop counterweight coated in SuperLuminova. On the reverse, a coin-edged case with "Original Gas Escape Valve" engraved into it. Inside an Automatic Rolex Cal. 3135, 31 Jewels, 28,800 Beats per hour. COSC Chronometer Certified workhorse. It is fitted with a Parachrom hairspring designed by Rolex; it offers greater resistance to shocks and to temperature variations. The watch comes fitted on its original Rolex 20mm solid end link 904L stainless steel Oyster bracelet with OysterLock safety clasp and glide-lock extension system which allows the watch to be worn over a divers suit, or be adjusted on the fly during the day. Comes with a Rolex box, service pouch, and guarantee card.
Points of Mention
This watch is sold with its original Rolex box and Rolex guarantee card, no extra paperwork is provided. The watch comes paired on its original Rolex bracelet with a signed Rolex clasp. The watch is from September 2007 and is sold in worn condition, but overall fair condition as you can see. The watch comes with our 12-Months Warranty.