It may or may not be off of a movie set. But if it had, it may not be a movie that made it to theaters (fan film of Predator or Gladiator?) You would think, that if some guy gave you a helmet, that you would ask what movie it was from or at least get some sort of history of the item. Mind you if it was made by some kid as an art project in school, would you pay 200 bucks for it? Probably not. But if it's movie memorabilia....the sky's the limit.
It's actually a screen test prop from Masters of the Universe. Charles Danson sculptured several test helmets for the movie, none of them were used. It's mostly worthless unless you like Masters or Charles Danson or anything I just said:lol