Original 1st printing 14&1/8 x 20" concert poster for the Jim Kweskin Jug Band (with Maria Muldaur) appearing with Big Brother & the Holding Company (featuring Janis Joplin) and Electric Train at the Avalon Ballroom in San Francisco, CA from 10/7-8/1966.
 
 Art by Stanley Mouse and Alton Kelley, image ("Girl With Green Hair") is # 29 in the Family Dog/Avalon series (*OP-1 in the Eric King guide) and has been HAND-SIGNED (in pencil) by Mouse.
 
 Medium-thick flat vellum stock poster is in good to very good (B to B/B+) condition; there are small pieces of clear tape in all four corners, along with a semi-soft stain and a pair of light tape pulls along the top margin, a few tiny edge/corner-tip dings, a whisper of handling wear, a tiny pin-prick glue spot above Mouse's signature, a touch of edge toning and a small stain on the reverse, otherwise fine.

 Absolutely FANTASTIC-looking ARTIST-SIGNED 1st printing example of this always-in-demand 1966 Avalon poster.