Original 1st printing 4 x7" concert postcard for John Mayall and The Psychedelic Stooges  Grande Ballroom in Detroit, MI from 11/10-13/1968.  This is a Type C postcard.
 
Art by Carl Lundgren, image is # 108 (card # 56) in the Russ Gibb Presents/Grande series.
 
Medium thin flat vellum stock card is in excellent condition.  There are tackholes on all four corners, otherwise nice.