23" x 16.125" poster for the Zap Comix #12 gallery opening and release party at the Psychedelic Solution Gallery in New York June 7, 1989. This poster is a composite of the two page "Zap Jam" comic that is in the Zap #12 comic. Artists: Rick Grifin, Robert Williams, R Crumb, Victor Moscoso, Spain, Gilbert Shelton, and S Clay Wilson. On heavy glossy stock. near mint condition. This poster is available at Wolfgang's Vault for $48.