Original 1st printing 8&1/2 x 11" concert flyer for the Sopwith Camel appearing at the Matrix in San Francisco, CA from 4/14-16 and 18-20/1967. 
 
 Art by C. Irvine, medium-thin flat stock flyer is in near mint to excellent (A- to A-/B+) condition; really nothing more than a few stray light pinch bends here and there and that's pretty much IT... a VERY sharp example of this oddball early-'67 Matrix flyer with a great design.