The 1st printing of the poster is identified by the presence of a tiny blue dot 1 1/4" to the left of 1967 at the bottom of the poster. There is significant variation in colors throughout this print run, the yellow ranging from a light canary to mustard color and the background from a light pink to rich magenta. It measures 13 15/16" x 20" and was printed before the concert.

The 2nd printing has brighter richer colors than the original printing, and the blue dot seen at the bottom of the 1st printing is omitted in this post-concert reprint. It measures 14" x 20".

Born in Spain, Victor Moscoso was the first of the rock poster artists with serious academic training and experience. At the Avalon Ballroom in San Francisco, Moscoso saw rock posters and decided that he could "make some money doing posters for those guys." In 1966, he began designing posters for the Avalon Ballroom; and under his own imprint, Neon Rose, a series for the Matrix, a San Francisco nightclub. Moscoso's style is most notable for its visual intensity, which was obtained by manipulating form and color to create optical effects. He used clashing, vibrating colors and deliberately illegible psychedelic lettering to demand attention.