Original 1st printing 20&7/8 x 16&1/4" concert poster for the Grateful Dead appearing at the Sacramento (CA) Memorial Auditorium on 8/12/1972. 

 Design by/show presented by Pacific Presentations, a nearly-identical image (from Seattle) is featured in the Art of Rock book on page 377 (plate 4.141).

 Medium-thick flat vellum stock poster is in near mint (A- to A-/B+) condition; really nothing more than a bit of light inking in the upper left corner, below the "Gr" of "Grateful" and in the lower right quadrant... physically, it's pretty close to being flawless.

 ULTRA-SHARP example of this classic 1972 Dead concert poster from Sacramento. These have been getting harder to come by in recent years, the supply seems to be drying up. Check out the show (complete with amusing between-song banter) HERE;

https://archive.org/details/gd1972-08-12.sbd.smith.gems.105132.flac16