German stuff is always popular all over the world. It's getting rarer now. I would love a decent Wehrmacht WW2 helmet. But all I have is reproduction.
On the other hand, WW2 US M1 helmets are getting expensive, particularly some of the rarer versions. I love the US stuff. I have four
M1 helmets now, two WW2 and a Vietnam era helmet plus a 1976 model of the last US steel helmet. It can cost as much as $500 for rarer versions. But even a basic original WW2 US helmet can be over $200. People are still throwing US helmets in the trash not knowing what they're worth.
I also have some British and Canadian helmets. Not so valuable but historically interesting nonetheless. Plus I have a British made MKII helmet which was used by the Irish army. I actually wore one while serving as a reservist back in the eighties. I bought it from an American, how it ended up in Ohio is anyone's guess.
But my pride and joy is a British made Brodie helmet from 1917 which was issued to the American expedionary force. It just reeks of history.
To finish my collection I have a some of the British nylon Mk6s and an American Kevlar from 1983.
Actually my collection isn't finished. I still need some German stuff and a good early war British helmet. Plus of course, I only have four M1 helmets. That's only the start.