Original 1st printing 8&1/2 x 11" concert flyer for the Sparrow (proto-Steppenwolf) appearing at the Matrix in San Francisco, CA from 5/9-11/1967. 
 
 Art by Jack Downing, thin flat stock flyer is in very good to excellent (B/B+ to B+) condition; there is a light discoloration/stain in the upper right margin, along with a small horizontal/diagonal pressure crease/bend along the top right margin, a slight bend along the lower right margin and a well-camouflaged handling ding or two hiding within the image area, otherwise it is a very sweet example of this strange-looking early-'67 Matrix flyer.