Original 1st printing 14&1/4 x 20" concert poster for Big Brother & the Holding Company (featuring Janis Joplin)* appearing with Blue Cheer in a legal-aid benefit for the Hells Angels Motorcycle Club, held at California Hall in San Francisco, CA on 2/3/1967.
 
 Art by Allen "Gut" Terk, image ("It's Party Time Again!") is featured in the Art of Rock book on page 207 (plate 2.248). 

 Medium flat vellum stock poster is in very good to excellent (B/B+ to B+) condition; there are a series of thin diagonal creases/bends along the top margin and in the upper right corner, along with a couple of tiny edge/corner-tip dings, a few light pinch bends scattered around the outer margin area and a few light smudges and pin-prick spots here and there, otherwise fine.

 A SUPERB example of this always-popular Hells Angels/Big Brother poster from early 1967. Check out a FASCINATING article (with additional photos from the event) about Phyllis Willner, (the girl riding on the back of "Hairy Henry's" chopper) HERE:

https://diggersdocs.org/category/phyllis-willner/