Quicksilver and Country Joe at Avalon Ballroom - 1967 (Poster)

Vintage (1st press) poster promoting shows with Quicksilver Messenger Service/Country Joe and The Fish at Avalon Ballroom in May of 1967. Designed by Rick Griffin. Family Dog Productions. "30" written in pencil on the back.

Measures ~ 20x14 inches. Some crinkling, see photos.