Original 1st printing, 14x21&1/8" concert poster for Credence Clearwater Revival, Steppenwolf, It's A Beautiful Day, Butterfield Blues Band, Ten Years After and Truth, at the Fillmore Auditorium in San Francisco, CA on 7/2-7/1968. 
 
Art by Lee Conklin, image is #127 in the Bill Graham/Fillmore series. 
 
The poster is in excellent/near mint condition.  Just a teeny corner bend and extremely light handling.