You mean aside from the beginning crawls of the films, right? I know that "Episode 4: A New Hope" was only tacked on to prints of SW distributed, I think, from 1979 on. Any prints that were original theatrical releases or rereleases from 1977 and 1978 simple said "Star Wars" in the opening crawl. From that point on, all films had the Episode # in the crawls. They never appeared in advertising or theatrical posters or trailers that I know of, though.