It measures 13-15/16" x 21-15/16" and has the vertical scratch that was printed on the first run in 1970. This vertical scratch is about 1-3/8" long and is 3/4" below the second D in Dead. According to several online sites, the second printing of 9-13-77, long after the concert, was 14" x 22" and did not print with the scratch line as this original one has on it.
There was even a third printing of 2013 and that measures 22-1/2" x 36" and is made on a glossy light stock. The item "1970 Original 1st Printing GRATEFUL DEAD Mushroom Man Bill Graham # 216 Poster" is in sale since Friday, October 28, 2016. This item is in the category "Entertainment Memorabilia\Music Memorabilia\Rock & Pop\Artists G\Grateful Dead\Posters". The seller is "eggbertabee" and is located in Middleton, Wisconsin. This item can be shipped to United States.