This is a vintage USN Mark V diving helmet air control valve. It is made of solid brass and was the first configuration used during the first half of the 20th century. In the 1916 US Navy diving manual, this style is shown in Plate VII. This is the double female air control that was discontinued during WWII and replaced with the double male model. One end is clearly stamped Morse Diving Equipment. The number 655 is also stamped into the valve. These are not easy to find and are a period correct part for your Mark V helmet from 1916 to roughly 1942.

All items will be shipped with a signature required upon delivery and full insurance either via FedEx or the USPS Priority Mail. Worldwide shipping is available; however, no ocean freight will be offered on large items. DHL Express is an option for international shipments under 600 pounds via air. Payment via bank wire for customers outside the USA is required. A shipping quote prior to the auction can be provided by emailing your postal code. International bidders are advised that some countries do not allow the importation of knives. Nations Attic is not responsible for shipping charges going or coming back if your countries customs denies delivery. Rejected items can be consigned into a future sale as there are no refunds.