Original 1st printing 11 x 17&1/2" concert poster for Spirit with the Elvin Bishop Group and Sha-Na-Na appearing at the Boston Tea Party (15 Lansdowne Street location) in Boston, MA on 10/9-11/1969. Art by Eric Engstrom, medium flat index stock poster is in excellent (B+) condition; a slight discoloration and a touch of moisture wear along the bottom margin, slight surface chipping in the lower right margin, a trace of toning and a touch of surface smudging just below "Sha-Na-Na", otherwise fine. Uber-groovy design on this one.