the stars and stripes Captain America helmet worn by Peter Fonda during the movie was up for auction recently... it was taken from the movie set in 1969 by the film's Assistant Director and has been part of his collection ever since

the paint wasn't meant to last longer than the movie production and so the fragile material flakes when handled. So much of the original paint has flaked off that it looks awful, and it failed to get a single bid over the minimum bid of $25,000.

The distinctive flight helmet worn by Tom Cruise as Pete “Maverick” Mitchell in the 1986 movie "Top Gun" sold for $406,250 in 2021

The most expensive movie helmet ever sold was Darth Vader's mask and helmet from "Star Wars: Episode V - The Empire Strikes Back (1980)" which fetched USD $1,152,000 in September 2019

but the record for most expensive headware at auction, is now the Wizard of Oz witch of the East hat, it sold for USD $2,930,000 two weeks ago in December 2024

https://newatlas.com/collectibles/easy-rider-helmet-passed-in/