This seems unlikely, but is this a font (being used, not in the shape of the logo)?

Nope. It's custom lettering by Dan Perri, drawn in a vanishing point perspective and intended for the opening crawl of the 1977 film. I can say that Futura Display and Compacta Black were seemingly used in some of the other marketing for Star Wars, including some of the international logos drawn to match the style of Perri's logo. Whether or not those exact typefaces were the basis for Perri's original logo is not discernible.

Possible Compacta Black modification demo: