I've seen lengthy MGM trailers on Turner Classic Movies promoting upcoming releases for an entire year. One from around 1967 or so shows stills in the cases of some films still in production at the time, (2001 is represented by a couple production paintings over narration) so this trailer makes some sense to me now. You may have scored the earliest media presentation of Star Wars outside of the 1976 World Science Fiction Convention!

The way Star Wars was regarded and marketed by the studio and others before it's success is as much a part of it's history as anything else. Please make an effort to preserve this if you can.

It would be cool if you can get the audio for this transferred as well.