Original 1st printing (red corner) 27&7/8 x 19&3/4" concert poster for Big Brother & the Holding Company (featuring Janis Joplin) appearing with Blue Cheer and Eighth Penny Matter at the Family Dog at 1601 West Evans in Denver, CO on 9/8-9/1967.
Art by Rick Griffin, image is # 79/D-1 in the Family Dog/Denver series. This is the large format (OP-2 in the Eric King Guide) version.
Medium flat index stock poster is in excellent (B+) condition; a thin matte indent with a slight discoloration (very minor) around the outer edges (about 1/4" on all sides) and a slight bit of moisture warping to the paper, otherwise fine.
A FANTASTIC-looking example of this extra-large Rick Griffin classic, the very first poster in the Denver series.