11x21" original first printing poster for Dec. 21-23, 1967 concerts featuring Buffalo Springfield, Collectors and Hour Glass (featuring future Allman Brothers Band members Duane Allman and his brother Gregg). This is first of three 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" at lower right corner above ticket outlet information strip. Poster art by Alton Kelley and Stanley Mouse feature photo image of two men standing in front of large mechanical turbine. A third man stands atop the turbine. Touch of age toning at bottom left margin but poster is o/w NM.