Original 1st printing 19&5/8 x 27&3/4" concert poster for the Grateful Dead's legendary Bill Graham-produced acoustic/electric shows at the Warfield Theatre in San Francisco from 9/25-10/14/1980.
Art by (and SIGNED in silver pen by) Dennis Larkins (with Peter Barsotti), image is featured in the Art of Rock book on page 345 (plate 4.45).
Thick glossy-coated index stock poster is in near mint to excellent (A-/B+ to B+) condition; just a tiny scuff/pull in the top left corner tip and a few tiny surface scuffs and fingerprints hiding within the image area, otherwise it is a nearly-unbeatable 1st printing example of this classic Grateful Dead image from a VERY fondly-remembered run of 1980 shows.
Check out a great-sounding soundboard (a Charlie Miller transfer) of the 9/26 show HERE:
https://archive.org/details/gd1980-09-26.sbd.miller.118444.flac16