Art by Gary Grimshaw, the image is featured in the Art of Rock book on page 297 (plate 3.131).
Medium-thin flat index stock poster is in excellent (B+) condition; aside from a couple of ultra-tiny edge tears and a nearly-invisible soft stain or two along the right-hand margin, a slight moisture stain in the lower left margin, a series of soft handling dings, a pin-prick surface spot or two and a couple of ultra-light tape shadows on the reverse, it is pretty much as sharp as they come (the paper is fairly fragile).
VERY hard-to-locate low-run '67 Grimshaw poster from a tiny Detroit nightclub.