Original 1st printing 14&1/8 x 17&3/4" concert poster for Big Brother & the Holding Company (featuring Janis Joplin) appearing with Lee Michaels and the Oxford Circle at the Avalon Ballroom in San Francisco, CA from 12/9-10/1966.
 
 Art by Victor Moscoso, image ("Swirly Eyes") is # 38 in the Family Dog/Avalon series.
 
 Medium-thick flat vellum stock poster is in very good to excellent (B/B+ to B+) condition; there are a couple of hairline-thin bends scattered along the upper right margin, along with a couple of stray edge/corner-tip creases, one or two nearly-invisible stress bends hiding within the image area and a whisper of surface dirt around the edges, otherwise it is a REALLY nice-looking 1st printing example of this oft-requested Family Dog image.