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 ULTRA-light handling (a nearly-invisible pinch ding/fingerprint smudge or two lurking within the image area) and a tiny spot in the upper right margin (which can really only be seen when the poster is tilted towards a light source) and that's pretty much all there is to speak of... a VERY sharp/crisp example of this classic 1972 Dead poster. 

 Check out the show (with amusing between-song banter) HERE;

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