I don’t know when it was first shown for the public but my brother got me some pre-release items at an auction. According to what he was told, and I have no idea if it is true or not, there was a pre-release showing of the movie in California for owners of multiple movie theaters. Anyway, the packet I have has copies of the different size Posters the movie houses could buy for displays and has prints of Ralph McQuarrie’s conceptual paintings amongst other things. I have not looked at it for a while but might dig it out to see what all is there. Duane
