Original 1st/only printing 20&1/2 x 26" concert poster for Quicksilver Messenger Service and Cactus at the Arizona State Coliseum in Phoenix, AZ on 7/9/1971. Art (Quicksilver lettering) by surf/psychedelic/comix legend Rick Griffin, thick foil coated index stock poster is in very good (B/B+) condition; a set of tack/staple holes (all four corners), a couple of subtle horizontal roll bends with a slight nick/crease in the right center margin, a few surface scratches and tiny edge nicks here and there, otherwise fine. A very-well preserved example of this SUPER-cool-looking Griffin Quicksilver poster on striking silver foil stock.