The pre-concert 1st printing is on vellum and bears union logo # 72 on the bottom right corner. This printing measures 14" x 20".
The 2nd printing, also on vellum, was printed after the concert and bears a "4(2)", which is not the poster's correct identifying number, in the lower left corner, and a "Lorin Gillette" credit across the bottom margin. This image measures 14" x 20", and the green-colored ink varies from light to olive to dark.
The post-concert 3rd printing is 14 1/8" x 20 1/2" on uncoated index and displays no union logo or Gillette credit. "No.9-3" appears in the lower right corner and the Washington Street address is in the lower left corner.
When the Avalon Ballroom and Bill Graham's Fillmore Auditorium began to hold weekly dance concerts, Wilson was called upon to design the posters. He created psychedelic posters from February 1966 to May 1967, when disputes over money severed his connection with Graham. Wilson pioneered the psychedelic rock poster. Intended for a particular audience, "one that was tuned in to the psychedelic experience," his art, and especially the exaggerated freehand lettering, emerged from Wilson's own involvement with that experience and the psychedelic art of light shows.