The 1st printing poster is identified by its lighter blue border, darker red center background, and coarse irregular stock. It matches the postcard. This original, pre-concert printing glows under a black light and measures 14" x 20".

The 2nd printing poster has a darker blue border, slightly lighter red center background, and brighter purple ticket outlet information strip. This post-concert reprint is on stock that displays a fine vertical pattern, and it does not glow under a black light. It measures 13 7/8" 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.