A modern copper diving helmet marked U.S.N. MARK V HELMET; image credit on full record.
Detail of nameplate on the modern Mark V-Mod-1 diving helmet; image credit on full record.
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Diving Equipment; Helmet, US Navy, Mark V, Brass & Copper.
A hard hat diving helmet, modern, copper helmet with four windows with intricate grillwork. Breastplate reads U.S.N. MARK V HELMET. Base with t... [more detail available via subscription]
