11x17" original first printing poster for May 17-18, 1968 concerts that took place at The Ark, an after-hours venue in the San Francisco Bay area city of Sausalito, CA. that was frequented by musical acts after performing in San Francisco. The Ark also served as a rehearsal and "test" site for new or re-worked numbers w/bands like Moby Grape, Big Brother & The Holding Company, The Steve Miller Band, Santana and Styx. The concerts promoted on this poster feature Clover, Womb, Truman Coyote and Circus. Art by Olsen shows view of topless woman w/concert text printed on her underwear. Poster was printed by Funky Fantasies, ©1968. Upper left corner has 1.25" crease, but poster is o/w Exc. Rare and obscure concert poster.