Original 1st printing 14&1/8 x 22&1/8" boxing-style/letterpress concert poster for Blue Cheer appearing from 11/8-9/1968 and Sly & the Family Stone appearing from 11/15-16/1968, all shows held at the Psychedelic Supermarket in Boston, MA.

 Designer unknown/not credited, extra-thick cardboard stock letterpress poster is in good/decent (B/B-) condition; there is a large tack hole with a tiny wedge pull and a 1&1/2" vertical tear in the top center margin, along with aadditional tack holes in the upper left/right corners, a series of tiny pressure creases scattered around the outer margin area and in the corner tips, a few stray stress creases and pin-prick moisture stains here and there, a 1/2" tear and a couple of tiny pulls in the bottom margin, a large ballpoint pen scratch on there reverse... the picture should tell the story on this one.

 Conditional issues aside, still an INCREDIBLY scarce (and definitely unusual) late-'68 low-run boxing-style poster from the legendary Boston parking-garage "ballroom".