Original 1st printing 14 x 20" 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 to near mint (A/A- to A-) condition; there are a couple of nearly-invisible handling dings/fingerprints hiding within the image area and a couple of ultra-tiny corner bumps, but for the most part it is an UNBEATABLE original 1st printing example of one of Rick Griffin's most iconic images from the Avalon series.