Original 2nd printing (1st postcard printing ) 7 x 4&5/8 concert postcard for the Quicksilver Messenger Service, The Don Ellis Orchestra, and Rockwell at the Fillmore Auditorium in San Francisco, CA on 6/18/21/1970. The postcard has an ad backing.
 
Art by, and signed by, David Singer, image is #239 in the Bill Graham/Fillmore series. 
 
Medium flat vellum stock postcard is in Near Mint/Mint (A-/A) ;  a fine-looking example of this early  postcard.