For those who are wondering, it was the '97 SE. Before the showing, the manager said that the provider of the 35mm print had connections with Lucasfilm, so I wasn't terribly shocked. Still, it was in higher quality than I'd ever seen ROTJ, and I enjoyed it very much. There were light scratches near the beginning, and a very slightly shaky picture around the same time, but it improved greatly later on in the film. (There were no enslaved Leia costumes in their contest... :( Oh well.) It was overall a superb experience.