Original 2nd printing, 14x21 &5/8" concert poster for Jimi Hendrix, John Mayall and Albert King at the Fillmore Auditorium in San Francisco, CA on 2/1-4/1968. 
 
Art by Rick Griffin, image is #105 in the Bill Graham/Fillmore series. 
 
The poster is in rough vintage condition.  There are multiple fold creases throughout, edgewear, surface wear, and tape pulls on all four corners.  No tackholes though.  The poster was definitely displayed.