Most early football games were simply a printed card stock ticket that was torn in half. However, Philadelphia was home to some of the early high visability football games and likewise their tickets tend to be of higher quality. I believe that many of the nicer tickets Ive seen were for games played at Franklin Field from 1890s-1910s.
Thanks to a heads up from Keith, here is my earliest full ticket from Franklin Field. The perforation is pretty visible on this one.