Original 1st printing 8&1/2 x 10&3/8" concert flyer for Canned Heat appearing with 90th Congress at the Boston Tea Party (53 Berkeley St location) in Boston, MA from 9/8-9/1967.

 Artist unknown/not credited, thin flat stock flyer is in good to very good (B to B/B+) condition; there are a pair of decent-sized semi-flattened (very hard-to-see) diagonal bends in the upper right corner/margin, a series of tiny edge tears, a few ultra-thin diagonal corner bends, a small nip out of the lower right corner tip and a well-camouflaged stress crease or two hiding within the image area, otherwise fine.

 GREAT-looking op-art design on this VERY uncommon late-'67 Tea Party flyer.