Unlike heavily mass-produced San Francisco psych art, Michigan venue posters from this era were printed in incredibly tight, localized runs (often fewer than 100 copies), making surviving examples exceedingly difficult to acquire. ARTIST SIGNATURE DETAILS:This specific copy is uniquely hand-signed in pencil on the back (verso) by legendary Detroit counterculture graphic artist Gary Grimshaw. The clear script signature reads “Gary Grimshaw – Alice Coltrane, Leon Thomas”, serving as a stunning artifact of rock and jazz design history. DETAILED CONDITION REPORT:This piece is offered in authentic, unrestored vintage condition. The front artwork remains vibrant with bold reds and blues. Notable signs of age include prominent creasing across the surface, edge wear, and a clean tear along the right-hand margin. Fully insured with tracking provided.