Original 1st printing 13&1/2 x 21" concert poster for Country Joe & the Fish appearing with the Hourglass (featuring Duane and Gregg Allman of the Allman Brothers Band) and the United States of America on 5/3/1968 and Moby Grape appearing with the Hourglass and U.S.A. on 5/2&4/1968, all shows held at the Fillmore Auditorium in San Francisco, CA.
Art by Mari Tepper, image is # 118 in the Bill Graham/Fillmore series.
Medium-thick flat index stock poster is in superb near mint (A-to A-/B+) condition; just a small 1/2" hard pinch bend/crease in the lower right margin/edge and a couple of nearly-invisible roll bends in the extreme upper margin area, otherwise fine.
Definitely a weird one, that's for sure.