Original 1st printing 7x 9 &1/4" concert postcard for John Mayall, Sha-Na-Na, Ra, Randall's Island, Grand Funk Railroad, Bloodrock, Johnny Winter, The J. Giles Band, Van Morrison, The Isley Brothers and Fanny, at the Fillmore West and Winterland, in San Francisco, CA on 4/8-11 &4/14-18/1971. The postcard is "Type B".  Van Morrison replaced Dave Mason in the lineup.  It has a schedule backing.
 
Art by Willyum Rowe, image is #276 in the Bill Graham/Fillmore series. 
 
Postcard is in excellent/nm condition.