Original 1st printing 14&1/4 x 20" concert poster for the Grateful Dead appearing with Moby Grape and the Steve Miller Blues Band at the Avalon Ballroom in San Francisco, CA from 12/23-24/1966.
 
 Art by Victor Moscoso, image is # 40 in the Family Dog/Avalon series.
 
 Medium-thick flat vellum stock poster is in very good to excellent (B/B+ to B+) condition; there is a slight discoloration (uneven toning) along the lower left margin (about 1" up from the bottom edge in the lower left corner, sloping downward at an angle towards the middle of the ticket outlet strip), along with a hint of corner-tip creasing in the upper left/right corners and a pair of tiny pressure indentations in the left margin, otherwise fine.

 VERY nice-looking example of this perennially popular Grateful Dead image from the Avalon.