Advertising Poster Siegel Schwall Buddy Guy Hour Glass Psychedelic. Original vintage advertising poster for a concert at Avalon Ballroom that took place in 1968 and included the performers - Siegel Schwall Buddy Guy Hour Glass Mance Lipscomb. Psychedelic illustration by Joel Beck of a man riding a dinosaur with people looking at him from the garden of a straw roofed house. The Avalon Ballroom was a music venue in the Polk Gulch neighbourhood of San Francisco, California, at 1244 Sutter Street. The space operated from 1966 to 1969, at the height of the counterculture movement. Excellent condition. Country of issue: USA, designer: Joel Beck, size (cm): 53x36, year of printing: 1968.