Original 2nd Printing, 14x20" concert poster for Big Brother & The Holding Company, Quicksilver Messenger Service, and Oxford Circle, at the Avalon Ballroom in San Francisco, CA on 2/17-18/1967. 
 
Art by Stanley Mouse, image is #48 in the Family Dog, Avalon series. 
 
The poster is in excellent.  There is a corner bend some light edgewear and a small smudge on top, otherwise nice.