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. 

 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/decent (B to B/B-) condition; there are quarter-sized discolorations/oil stains in all four corners, along with a series of small "mouse bites" out of the upper right margin, a bit of toning and a thin bend along the right margin, a surface pull on "Tickets", a few tiny pin-prick scuffs, tiny stress bends/handling dings here and there and a few tiny edge nicks scattered around the outer margin area, otherwise OK. 

 A very sweet-looking used example of this perennially popular Southern California Jefferson Airplane/Ten Years After concert poster from a fairly large outdoor stadium show. Read more about this show (and other concerts) held at Balboa Stadium HERE;

https://sandiegotroubadour.com/2012/06/balboa-stadium-music-in-the-landing-pattern/