Original 1st printing 17&3/8 x 22&1/2" concert poster for Jefferson Airplane appearing with Ten Years After, the Sons of Champlin and Congress of Wonders at Balboa Stadium in San Diego, CA on 7/27/1969/1967. 
 
Artist/designer unknown, image is featured in the Art of Rock book on page 286 (plate 3.99). 
 
Medium-thick flat vellum stock poster is in good vintage condition. There is some surface wear, a small edge tears, a tiny tear in the top, a hint of toning, and small black marks throughout (they look like fingerprints.  The poster has a small crease down the middle, like it was folded at one time.