Original 1st printing 12&3/4 x 18&5/8" concert poster for the Steve Miller Band appearing with Allmen Joy and Linn County at the Avalon Ballroom in San Francisco, CA from 2/21-23/1969.

 Art by (and SIGNED in gold ink by) Alton Kelley, image ("Radioactive") is featured in the Art of Rock on page 111 (plate 2.30) and is part of the Soundproof Presents/Avalon series. 

 Medium flat index stock poster is in excellent (B+) condition; there is an approximately 1&1/2" diagonal bend in the upper left margin, along with a tiny bend in the lower left corner tip, a couple of VERY soft bends along the bottom margin and a soft handling ding or two hiding within the image area, otherwise it is an absolutely SUPERB ARTIST-SIGNED example of this bizarre Kelley image from the Soundproof/Avalon series.