Original 1st printing 14 x 20" concert poster for Quicksilver Messenger Service appearing with Kaleidoscope (featuring David Lindley) and Charlie Musselwhite (who has also HAND-SIGNED the poster in silver pen) 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 ULTRA-crisp near mint (A-) condition; aside from a couple of nearly-invisible handling dings/fingerprints hiding within the image area it is an essentially UNBEATABLE original 1st printing example of one of Rick Griffin's most iconic images with a nice large performer signature (originally obtained by the consignor).