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 excellent (B+) condition; aside from a few tiny nicks/pin-prick rust spots, a few semi-soft handling creases and a touch of toning around the outer margin area and a tiny corner-tip bump or two, the main body of the poster looks really nice and clean. 

 An overall GORGEOUS 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/