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the British Brodie style helmet in the first photo is the most collectable of the two, since it has the CD insignia and the helmet is more like a military type steel helmet worth about $20
the second one with the huge dome is the most common type and the least valuable, I had some of these and could NOT even give them away, they arent even worth the cost of shipping, maybe worth $5 at the swap meet.
maybe you could use it for bullet penetration tests? just for fun, to see how well it holds up to shotgun blasts or small handgun fire.
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The first one (Brodie style) is a civilian helmet (Hard Hat) made by the Acme Protective Company some time later as March 2, 1926. That's when Edward Cairns patented the liner, patent #1,575,251 .
