Original 1st printing 14&1/4 x 19&7/8" concert poster for the Daily Flash appearing with Country Joe & the Fish at the Avalon Ballroom in San Francisco, CA on 10/21-22/1966.
Art by (and SIGNED in pencil by both) Stanley Mouse and Alton Kelley, image is # 31 in the Family Dog/Avalon series. This is the corrected dates/2nd-state edition (OP-2).
Medium-thick flat vellum stock poster is in very good to excellent (B/B+ to B+) condition; there are multiple tack/staple holes in each corner (and in the lower right margin), a light amount of handling wear, a thin 3/4" pull in the top center margin, a couple of tiny edge/corner creases and a few soft smudges along the bottom margin, otherwise fine.
Great-looking DOUBLE-SIGNED example of this classic early Family Dog image.