Original 1st printing 14&1/4 x 21&7/8" concert poster for Sanpaku and Crystal Syphon(e) appearing together at Berryessa Bowl in Napa, CA on 5/31/1969.

 Art by "WEK II", medium-thick flat index stock poster is in good to very good (B to B/B+) condition; there are tape marks/pulls in all four corners, a bit of a curl to the paper from being rolled, a series of light handling dings and tiny stress bends scattered around the image area/margins, light surface wear and a series of pronounced tape stains/pulls on the reverse, otherwise fine.

 Cool-looking "Captain America"-themed concert poster from an obscure Northern California venue.