Original 13&7/8 x 21&3/4"  concert poster for Chicago, James Cotton Blues Band and Family Fritz, at the Fillmore West in San Francisco, CA on 3/26-29/1970.
 
Art by David Singer, image is #225 in the Bill Graham/Fillmore series. 
 
Poster is in very good/excellent condition.  Just some edge wear and two corner bends .