Original 1st printing 9&1/4 x 11&1/2" concert flyer for the Great Society (featuring a pre-Jefferson Airplane Grace Slick) appearing with Dan Hicks (Charlatans) and/or Don Garrett at the Matrix in San Francisco, CA, beginning on 6/21/1966 (unknown how long the engagement ran for).
Art by William Reid, image is featured in the Art of Rock book on page 164 (plate 2.113).
Medium-thick flat vellum stock flyer is in excellent (B+) condition; aside from a few thin/nearly-invisible bends along the left/right margins, a stray edge nick or two and a couple of ultra-soft handling dings, this example is just as bright/crisp as can be.
GREAT-LOOKING classic early (1966) Matrix item, I used to get asked for this piece CONSTANTLY. This is actually the first one of these I have ever had the pleasure of offering.