Original 1st printing 13&3/4 x 28&5/8" concert poster for an all-blues show featuring John Mayall, Bo Diddley, Muddy Waters, Otis Spann and Magic Sam appearing together at Winterland in San Francisco, CA from 3/27-29/1969.
Art by Greg Irons, image (handbill w/extra ticket strip) is featured in the Art of Rock on page 349 (plate 4.55).
Medium-thick flat index stock poser is in good to very good (B to B/B+) condition; there are a series of semi-soft horizontal roll bends traversing the image area, a few tiny pressure bends/creases scattered around the outer margins and a VERY soft diagonal hairline bend extending from the top center margin down to the "B" of "Bo" (mostly visible from the reverse), otherwise fine. Most of the conditional issues on this piece are fairly well-camouflaged.
AWESOME-looking Greg Irons image from "The Art of Rock", these have been somewhat hard to come by as of late.