Weisser's underwater kingdom for top billing Country Joe & the Fish features an octopus whose suction-cup tentacles provide the lettering. Bay Area interest peeks through a canyon crevasse.
The postcard was printed before the concert, and it measures 4 5/8" x 7 1/4".
There were also some pre-concert double-sized mailers printed that were conjoined with the BG119 image (see BG119/120). They measure 4 1/2" x 14 1/4".