Original 1st printing 5 & 1/4 x 8 & 1/2" concert flyer/handbill for Bill Graham presents: Quicksilver Messenger Service, Ten Years After, Smith, Eric Mercury and Birthrite, at the Olympic Aditorium in Los Angeles, CA, on 3/21/1970.
 
Artist unknown.
 
The flyer has a few small handling creases, otherwise it's in nice shape.