Original 1st printing 15 x 22&1/2" cardboard concert poster for Emerson, Lake & Palmer appearing with Back Door at the Memorial Coliseum in Portland, OR on 2/13/1974. 

 Design by/printed by Washington Poster Co., extra-thick cardboard stock poster is in near mint to excellent (A-/B+ to B+) condition; really nothing more than a tiny corner-tip bump or two, a stray pin-prick indentation in the lower margin, a touch of light surface wear (a few spots of dirt) and a postage-stamp-sized "Manticore" sticker (likely from the band's management company) in the lower right border of the image area and that's just about it.... a very sharp-looking example.  

 GREAT-looking cardboard concert artifact from the UK prog-rock supergroup.