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 poster is in decent/used (B/B- to B-) condition; there are small red tape remnants along the top margin and in the lower right corner, along with a pair of staple/nail holes in the top center margin, a series of creases/nip tears and tiny stains scattered around the outer margin area, a 1&1/2" tear in the upper right margin, another 1&1/2" tear in the bottom center margin, a series of small puncture holes (4 total) and a few stray stress creases/tiny surface indentations hiding within the image area and a large moisture stain on the reverse... definitely a well-traveled (but still intact) example of this weird-looking Greg Irons poster from one of only a few non-Bill Graham-produced shows held at Winterland in 1969.