Original 1st printing 14&1/4 x 20" concert poster for Quicksilver Messenger Service appearing with Big Brother & the Holding Company (featuring Janis Joplin -her first headlining performances with BBHC) at the Avalon Ballroom in San Francisco, CA from 6/24-25/1966.

 Art by Stanley Mouse and Alton Kelley, image ("Zig-Zag Man") is # 14 in the Family Dog/Avalon series. 

 Medium flat vellum stock poster is in decent/used (B/B- to B-) condition; the poster is moderately toned with a decent amount of wear (tack holes, tape pulls/stains) in all four corners, along with a series of light surface stains, handling dings, pin-prick spots, a couple of holes and a small indentation between "Zig" and "Zag", a small tear in the left margi and a moderate to heavy amount of toning on the reverse... this one has defnitely seen better days, but it's a survivor.

 This particular example leans rather heavily towards the silver/"pewter" end of the spectrum on the metallic pass of ink, most I have seen are closer to gold/brown.