An original advertising handbill from S.F. State College for the last legendary “Acid Test” event before LSD was made illegal in California (in October 1966). Nicknamed “Whatever It Is” or “The X Handbill,” this charismatic little piece is not great artistically, but it represents oodles of history — both the Grateful Dead and head Merry Prankster Ken Kesey were there. Enthusiastically discussed by collector Pete Howard of PosterCentral.com (phone 805-540-0020, email pete@postercentral.com). If you’re into the psychedelic scene, be sure to check out some vintage psychedelic concert posters shown on this page right here on my web site: http://www.postercentral.com/psychedelic.htm