Original 1st printing 11&1/8 x 17" concert poster for the Grateful Dead with the Bonzo Dog Band appearing at the Boston Tea Party (15 Lansdowne Street location) in Boston, MA on 10/2-4/1969. Art by Eric Engstrom, medium flat index stock poster is in excellent to near mint (B+/A-) condition; aside from the slightest discoloration in the bottom center margin (about 2&1/2" across, very well-hidden) and a couple of stray tiny surface chips in the left margin and top left corner (mostly confined to the white border), this is as sharp an example of this VERY uncommon Tea Poster as I've seen. No tapes exist, but you can read all about the October 1969 exploits of the G.D. HERE: 

http://lostlivedead.blogspot.com/2010/02/grateful-deadjerry-garcia-tour.html