Original 1st printing 14&1/8 x 20" concert poster for the Jim Kweskin Jug Band appearing with Big Brother & the Holding Company (featuring Janis Joplin) and the Electric Train at the Avalon Ballroom in San Francisco, CA on 10/7-8/1966. Art by Alton Kelley and Stanley Mouse (who also SIGNED the poster in pencil), image is # 29 in the Family Dog/Avalon series. Medium-thick flat vellum stock poster is in absolutely stunning near mint (A- to A-/B+) condition; only a trace amount of toning along the bottom edge, a tiny edge ding in the lower right margin and a whisper of handling, otherwise it's a GORGEOUS 1st printing SIGNED example of this classic 1966 Mouse/Kelley FD image.