The 1st printing poster is identified by the unbroken white Moscoso signature at the bottom right hand side of the poster. The blue is a dark turquoise color, and it measures 14" x 20". It was printed before the concert.
The 2nd printing is characterized by the elimination of the letters in Moscoso's signature and those in the ticket outlets strips where the orange background merges with the letters. It measures 14" x 20" and was printed after the concert.
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.