Searching For 92 Year Old Man Who Vanished Without A Trace Usage Everyday Usable, Unisex Usable, Best for Gift. Antique 18 diving vintage u. s navy boston mark v deep sea divers helmet replica weight 7.5 kg (approx). This item is in the category Antiques\Maritime\Diving Helmets. The seller is collectible-shop and is located in this country IN.