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 Dennis Larkins (who also SIGNED the poster in silver pen just beneath the "WA" of "Warfield") and 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 excellent (B+) condition; a few stray fingerprint/tiny stress bends hiding around the image and a hint of edge/corner wear (a couple of really small dings), otherwise fine.
An overall SUPERB-looking example of this classic Grateful Dead image from a fondly-remembered run of Bay Area 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