Original 2nd printing (1st postcard printing ) 7 x 4&1/2 concert postcard for Porcol Harum, Pink Floyd and H.P. Lovecraft at the Fillmore Auditorium in California on 11/9/1967 and at Winterland on 11/10-11/1967.  The postcard has a "place stamp here" backing.
 
Art by Nicholas Kouninos, image is #92 in the Bill Graham/Fillmore series. 
 
Medium flat vellum stock postcard is in E/NM.  There are three small tackholes on the top of the card, otherwise a fine-looking example of this early postcard