Original 1st printing 16&7/8 x 22&1/2" concert poster for Traffic (featuring Steve Winwood) appearing with the Electric Flag and Steppenwolf at the Earl Warren Showgrounds in Santa Barbara, CA on 4/6/1968.
 

 Art by Frank Bettencourt, image is featured in the Art of Rock book on page 267 (plate 3.43) and is part of the Jim Salzer Presents series. 
 
 Medium-thin glossy stock poster is in near mint to excellent (A-/B+ to B+) condition; aside from a few soft handling dings here and there, a minor amount of edge wear (a couple of tiny edge nip tears in the lower left margin/corner and a few EXTRA-tiny corner-tip bends) and a tiny stress crease or two hiding within the image area, otherwise it is a VERY sharp-looking example of this ultra-vibrant early-'68 poster from the Salzer series; check out a great informative list of 1960's-era shows (including this one) held at the Earl Warren Showgrounds:

http://earlwarrenshowgroundsetal.blogspot.com/2010/09/earl-warren-showgrounds.html