Original 1st printing, 14 x 22" concert poster for the Byrds, and Fleetwood Mac, at the Fillmore West  in San Francisco, CA on 1/2-4/1970.
 
Art by David Singer. image is #210 in the Bill Graham/Fillmore series. 
 
The poster is in excellent/nm condition.  Just a tiny smudge near the bottom, otherwise really nice.