Original 1st printing 16&1/8 x 21&1/8" concert/event poster for the Free John Sinclair concert, held at the Grande Ballroom in Detroit, MI from 1/24-25/1970.

 Performers/speakers listed include: MC5, the Stooges (with Iggy Pop), SRC, Up, Commander Cody, Amboy Dukes, Bob Seger System, the Rationals, Jagged Edge, Sky, Wilson Mower Pursuit, Scorpion, Virgin Dawn, All the Lonely People, Brownsville Station, Floating Circus, Sunday Funnies, Shaky Jake, Blues Train, 3rd Power, Abbie Hoffman, Ken Cockrell, Skip Taube and Ed Sanders (the Fugs)..

 Art by (and SIGNED in black flair pen by) Gary Grimshaw, image is featured in the Art of Rock book on page 395 (plate 4.193).

 Medium-thick flat vellum stock poster is in very good (B/B+) condition; there is a small horizontal ink smear in the lower left margin, along with a couple of tiny smudges on the right-side red banner, a soft handling ding/stress bend or two hiding within the image area, a tiny nip tear in the left center margin, staple holes in all four corners, a slightly-worn bottom left corner tip and a few tiny edge digs scattered around the outer margin area, otherwise fine.

 MEGA cool-looking early 1970's SIGNED Gary Grimshaw poster from one of the first John Sinclair benefits.