Unknown bootleg, approxinately 14 & 1/4 x 20 & 1/2, concert poster for  The Yardbirds and Country Joe & The Fish performing at the Fillmore Auditorium in San Francisco, Ca, on 10/23/1966.  The poster does not have the Wes Wilson credit near August 13.
 
Art by John Meyers.  
 
Excellent condition. Just a small crease or two