Advertising Poster Quicksilver Messenger Service Psychedelic Music Concert. Original vintage advertising poster for Quicksilver Messenger Service music concert at the Avalon Ballroom featuring a psychedelic illustration of horses, men, and animals, with lightning and trees in the background, tree leaf pattern, red and blue frame around the image. 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: Jack Hatfield, size (cm): 51x36, year of printing: 1967.