Original 1st printing (OP-2 in the Eric King guide, the lighter/"money" green version) 13&7/8 x 19&7/8" concert poster for the Grateful Dead appearing with the Oxford Circle at the Avalon Ballroom in San Francisco, CA on 11/4-5/1966.
Art by Alton Kelley and Stanley Mouse, image is # 33 in the Family Dog/Avalon series.
Medium-thick flat vellum stock poster has been professionally restored to excellent (B+) condition; there are filled pin/tack holes in each of the four corners, along with a bit of waviness/moisture rippling (the piece was washed to remove toning), plus a couple of tiny edge dings, a tiny pin-prick surface mark or two hiding within the image area and a stray thin stress bend or two, otherwise fine.
A VERY nice-looking cleaned-up example of the 1st printing FD 33 poster.