Original 1st printing 8&1/2 x 11" concert flyer for the Daily Flash and Country Joe & the Fish at the Avalon Ballroom in San Francisco, CA on 10/21-22/1966.
Art by Stanley Mouse and Alton Kelley, image is # 31 in the Family Dog/Avalon series (OHB-D in the Eric King Guide)- this is the corrected dates/2nd-state edition.
Thin flat stock flyer is in near mint to excellent (A-/B+ to B+) condition; just a light amount of handling wear and a couple of thin creases in the left center margin, otherwise fine.
An overall SUPERB-looking example of this early (1966) Avalon Ballroom flyer.