Original 1st printing 17&1/2 x 22&3/4" concert poster for a late-September 1968 series of shows held at the Matrix in San Francisco, CA.

 Shows listed include: Spooky Tooth with David Blue (9/17-21), Sea Train (9/24-28) with Petrus* (9/24-26) and with Cleveland Wrecking Company (9/27-28). *misspelled as "Petros"

 Art by George Chacona and Marty Rice, image is featured in the Art of Rock on page 166 (plate 2.119).

 Medium flat vellum stock poster is in very good to excellent (B/B+ to B+) condition; there is a bit of light creasing, a couple of tiny nips/dings and a couple of light surface stains along the upper/lower left margin, along with a few light handling creases and thin stress bends hiding within the image area, a small 1/4" tear in the top center margin, a hint of paper toning and a couple of tiny pin-prick indentations/scratches along the left/right margins, otherwise it is a fine-looking example of this underground comix-inspired poster from the Matrix.