Original 1st printing 11 x 17" concert poster for Mountain appearing with Chuck Berry and Bo Diddley at the Boston Tea Party (15 Lansdowne Street location) in Boston, MA from 9/18-20/1969.

 Art by Eric Engstrom, medium-thick flat index stock poster is in excellent (B+) condition; there are a couple of tiny pin-prick residue smudges on the "ry" of "Berry" and just to the right of "Diddley", along with a small corner-tip bump/split in the top left corner, a couple of tiny pin-prick spots/surface smudges and a soft handling crease along the bottom margin, otherwise it is a mostly-clean example of this simple (but efficient) Tea Party concert artifact from late 1969.

 Interesting piece, it almost looks like it came from the late-1970's new-wave era.