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 tiny tack ring indentations in all four corners with a couple of tiny holes and a 1/8" corner-tip nip in the lower left corner, along with a tiny tack hole nick/indentation in the lower right margin, a few light pinch dings/tiny pressure creases scattered around the outer margin area and couple of soft handling creases hiding within the image area, otherwise fine.

 Absolutely FANTASTIC 1st printing 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/