This is an original chewbacca mask from the set of the first Star Wars. The director decided not to use it because he wanted Chewbacca to look friendlier and this mask has a snarl. There is an interview with Mark Hamill where he mentions the mask on Entertainment Tonight.
The item "Original Star Wars chewbacca mask movie prototype" is in sale since Monday, June 4, 2018. This item is in the category "Entertainment Memorabilia\Movie Memorabilia\Props\Originals". The seller is "ertri68" and is located in Bakersfield, California. This item can be shipped to United States.