Just had a long conversation with Steve Pearson, movie poster dealer since the 1970s and owner of DejaVuGallery.com. He used to own stores in the LA area.
He told me back in 1977 Lucasfilm directly sent him 300 rolled/folded Star Wars one sheets, as well as 10 Star Wars insert posters for promotional purposes. He has sold or given away all but a handful of the one sheets but still has seven of the inserts.
Anyway, the inserts he received have "LucasFilm 1977" on them, like this:
These "Lucasfilm" inserts generally have been considered video one sheets (or bootlegs) but it appears at least some are original Lucasfilm promotional inserts.
So to the best of my information, there are two legit versions, original 20th Century Fox (left), original LucasFilm (middle), and bootleg (right):