Art by Gary Grimshaw, the image (poster) is featured in the Art of Rock book on page 297 (plate 3.131).
Medium-thin flat stock flyer is in good/decent (B to B/B-) condition; there are a series of light splatter stains in the lower left margin/corner, a couple of ultra-tiny pin/staple holes along the top margin, a few soft edge creases, light toning, a set of soft tape pulls/residue marks on the reverse and a hint of surface wear, otherwise fine.
Very presentable example of this low-run mid-'67 Grimshaw flyer from a tiny venue in Detroit.