Original 1st printing 20 x 14&1/8" concert poster for Quicksilver Messenger Service and Country Joe & the Fish appearing together at the Avalon Ballroom in San Francisco, CA on 5/19-21/1967. Art by (and SIGNED in silver ink by) Rick Griffin, image ("Sutter's Mill") is # 62 in the Family Dog/Avalon series. Medium flat index stock poster is in absolutely stunning near mint (A-) condition; just the slightest whisper of handling/surface wear, otherwise it's an overall fantastic-looking SIGNED example of this classic 1967 Griffin FD image.