Official artist-issued 3rd (1982 Jose's Late-Night Final) printing 21&7/8 x 27" concert poster for the Grateful Dead appearing with the Sons of Champlin and Initial Shock at the Avalon Ballroom In San Francisco, CA from 1/24-26/1969.
 
 Art by Rick Griffin, image ("Aoxoamoxoa") is featured in the Art of Rock book on page 109 (plate 2.24) and is part of the Soundproof Presents series.
 
 Medium-thick glossy-coated index stock poster is in near mint (A- to A-/B+) condition; aside from a few tiny pressure creases running along the left/right margins and a trace of handling wear, it is in REALLY nice shape.

 Check out the 1/26 show (a great-sounding Charlie Miller transfer) HERE:

https://archive.org/details/gd1969-01-26.sbd.miller.109642.flac16