Original 1st printing 3&5/8 x 8&1/2" concert handbill for Big Brother & the Holding Company (featuring Janis Joplin) appearing with the Oxford Circle on 8/5/1966 and rock & roll pioneer Bo Diddley appearing with with the Sons of Adam on 8/6/1966, both shows held at the Avalon Ballroom in San Francisco, CA.
Art by Stanley Mouse (who also SIGNED the piece in pencil) and Alton Kelley, image ("Dollar Bill") is # 19 in the Family Dog/Avalon series.
Thin flat stock handbill is in excellent (B+) condition; a pair of staple holes in the upper left/right corners, a tiny smudge in the top right corner tip, a couple of stray pin-prick surface marks a hiding within the image/margin area and a VERY light amount of handling wear, otherwise fine.