Original  4&5/8 x 7 concert postcard for Chicago, James Cotton Blues Band and Family Fritz, at the Fillmore West in San Francisco, CA on 3/26-29/1970. The postcard has a schedule backing.
 
Art by David Singer, image is #225 in the Bill Graham/Fillmore series. 
 
Postcard is in excellent condition.  Just some light edge/corner wear.