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 Stanley Mouse and 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 GORGEOUS mint/near mint to near mint (A/A- to A-) condition; an absolutely STUNNING example of this somewhat weird Mouse/Kelley image from the Soundproof/Avalon series.