Official promoter-issued (1968) 2nd printing 14 x 19&7/8" concert poster for Quicksilver Messenger Service appearing with Kaleidoscope (featuring David Lindley) and Charlie Musselwhite at the Avalon Ballroom in San Francisco, CA from 1/12-14/1968.

 Art by Rick Griffin, image ("Eternal Reservoir (or the Source") is # 101 in the Family Dog/Avalon series.

 Medium flat index stock poster is in absolutely fantastic mint/near mint (A/A-) condition; nothing more than a STUNNING example of one of Griffin's most iconic images from the Avalon series.