11x21” first printing poster for Dec. 21-23, 1967 concerts featuring Buffalo Springfield, Collectors and Hour Glass. This is first of 3 variants of the first printing poster all of which pre-date the concert. This is printing A and is noted by the misspelling of “B. Grahm” in lower right corner above ticket outlet information strip. Poster art by Alton Kelley and Stanley Mouse feature photo image of 2 men standing in front of large mechanical turbine. A third man stands atop the turbine. Light corner tip wear but Exc.