Rolex - The Geneva Watch Auction: XIII Lot 1 May 2021 | Phillips
Tropical Mk II Double-Red' Sea-Dweller, Ref. 1665 | Stainless steel wristwatch with date and helium escape valve | Circa 1971 | Fine Watches | 2022 | Sotheby's
What is a Helium Escape Valve? - YouTube
Deepsea Challenge - The horizon of the deep | Rolex®