There are two variations of the 1st printing. Both display the same ranging shades of purple, red, magenta and yellow, and both were printed before the concert.
The 1st printing A measures 14 1/16" x 19 15/16".
The 1st printing B is longer, measuring 14 1/16" x 20 1/4".
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.