ROLEX, REF. 1665,”MARK V”, “DOUBLE-RED SEA-DWELLER”, A STEEL WRISTWATCH WITH DATE ON BRACELET CIRCA: 1978 CASE MATERIAL: Steel CASE DIAMETER: 40mm SERIAL NO’: 5082967BRACELET MATERIAL: Steel BRACELET SIZE: 175mm Approximate Overall Length, End Links Stamped “585” Bracelet Stamped “93150” DIAL: Black MOVEMENT: Automatic FUNCTIONS: Date BOX: NoPAPERS: NoMade for approximately 10 years from 1967 to 1977, the reference 1665 was the first timepiece designed for use in saturation diving. It was fitted with a Rolex patent gas escape valve in the band and guaranteed waterproof to 610 meters depth. The valve was first developed on the Submariner model and allows helium and other gases to escape, enabling the watch to stand compression.The 'Sea-Dweller Submariner 2000' is printed in red only for the early examples of 1665 and nicknamed 'double red'. Featuring so-called MK V dial, this present example was produced in around 1978 bearing case number 5 million.