Original 1st printing 14 x 20" concert poster for the Paul Butterfield Blues Band (featuring Mike Bloomfield and Elvin Bishop) with Jefferson Airplane at the Fillmore Auditorium in San Francisco, CA on 4/15&17/1966 and at Harmon Gymnasium on the Campus of U.C. Berkeley on 4/16/1966. Art by Wes Wilson, image ("Blues-Rock Bash") is # 3 in the Bill Graham/Fillmore series. Medium-thick flat vellum stock poster is in very good (B/B+) condition; a pair of tack holes in the top/bottom center margins, a slight bit of handling/creasing along the left and bottom margins, a pair of slight 1" bends in the right center and lower right corners and a minor amount of of handling/surface wear, otherwise fine. Great-looking example of a VERY early original 1st printing 1966 Bill Graham poster with a killer Wes Wilson design.