Hi, going to be a little humorous here. It is indeed a real helmet, just not an Imperial German Pickelhaube. As 'Bobted' said, welcome! Also, if it fits, it's a great piece for carnival or costume parties. You can try to sell it on eBay, as a theatrical helmet, but I think it would be more fun to figure out which production it was made for. It's not a cheap stage piece, but professionally done. IMHO.
Cheers!
Ron