The official Star Wars T-shirt from 1977 features the iconic logo by Suzy Rice on the front, and “May the force be with you” on the back. The latter is set in all-caps Tabasco, with some of its alternate hyper-extended glyphs.
If you purchased the soundtrack to Star Wars in 1977, the flyer shown above was inside. It additionally uses Helvetica (incl. the Black weight which served as basis for Rice’s logo), Stencil (ATF) set on an angle, and Futura (for “black T-shirt only”).