Original 1st printing 11 x 16&7/8" concert poster for Mountain (featuring Leslie West) appearing with Humble Pie (featuring Steve Marriott and Peter Frampton) and Eric Mercury at the Boston Tea Party (15 Lansdowne Street location) in Boston, MA from 11/20-22/1969.

 Art by Eric Engstrom, medium flat index stock poster is in excellent to near mint (B+ to B+/A-) condition; just a couple of tiny thin hairline bends in the upper left/right corners/margins, a flattened thin diagonal bend traversing the top border of the design, a tiny pull in the lower left corner tip and a stray soft pinch ding or two, otherwise fine.

 Really nice-looking original 1st printing late-'69 Tea Party poster with an unusual design and an interesting lineup.