This is a historic U.S. Navy Mark V diving helmet, manufactured by the renowned Morse Diving Equipment Co. of Boston, Massachusetts, with a manufacturer’s nameplate dated August 29, 1941.
Design and Construction: Crafted from heavy-duty copper and brass, featuring a traditional 12-bolt breastplate, protective port guards, and a hinged faceplate.
Historical Background: The Mark V design was standardized by the U.S. Navy around 1916 and remained the standard helmet for deep-sea salvage operations and military diving missions for several decades.