Original 1st printing 15&1/2 x 22&1/8" concert poster for Chicago appearing with River at Springer's Ballroom outside of Portland, OR on 3/15/1970.

 Art by Michael James Strickland, medium-thick flat index stock poster is in ULTRA-SHARP mint/near mint to near mint (A/A- to A-) condition; with the exception of a tiny pressure crease in the left side of the ticket outlet strip, it is a PERFECTLY-preserved/nearly-untouched example of this great-looking low-run psychedelic poster from the fondly-remembered Oregon ballroom. GORGEOUS colors on this one.