Original 1st printing 14&1/4 x 20" concert poster for the 13th Floor Elevators (featuring Roky Erickson) appearing with Quicksilver Messenger Service at the Avalon Ballroom in San Francisco, CA from 9/30-10/1/1966.
 
 Art by Stanley Mouse and Alton Kelley, image ("Zebra Man") is # 28 in the Family Dog/Avalon series. (OP-1 in the Eric King guide)
 
 Medium-thick flat vellum stock poster is in excellent (B+) condition; there are a couple of tiny creases and a few minuscule edge dings along the top margin, along with a slightly rounded top left corner tip, a bit of VERY subtle toning along the lower right margin, a tiny bend in the lower left corner tip and a bit of uneven toning on the reverse side, otherwise it is an absolutely SUPERB-looking 1st printing example of the classic Mouse/Kelley Avalon "Zebra Man" poster.... the orange fade is REALLY pronounced on this one.