Original 1st printing 11 x 17" concert poster for the Grateful Dead appearing with New Riders of the Purple Sage at the Assembly Hall on the campus of the University of Illinois in Champaign, IL from 2/21-22/1973.

 Design by Joe Hough (central image courtesy of Edmund Sullivan, by way of Stanley Mouse and Alton Kelley), medium-thin glossy stock poster is in near mint to excellent (A-/B+ to B+) condition; just a few ultra-soft handling dings and a stray stress crease or two hiding within the image area, a dated (2/23/1973) stamp from the student activities office (just above "7:00") and a quartet of VERY light tape shadows on the reverse, otherwise fine.

 ULTRA-uncommon early-'70's GD poster from the Midwest, FIRST one of these that I have ever seen. Check out the 2/22 show (Charlie Miller transfer) HERE: 

https://archive.org/details/gd1973-02-22.sbd.miller.111169.flac16