Official promoter-issued 3rd printing 14 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 (and SIGNED in black flair pen by) Stanley Mouse (and Alton Kelley), image ("Zig-Zag Man") is # 14 in the Family Dog/Avalon series. 

 Medium-thick flat vellum stock poster is in near mint (A-) condition; really nothing more than a well-hidden handling ding or two lurking within the image area and a tiny bend in the bottm right corner tip, otherwise it is a VERY sharp/clean ARTIST-SIGNED example of this iconic early Family Dog image.