Original 1st printing 4&1/4 x 6&3/4" ad-backed (blue ink) concert handbill for "Black Magic Rock & Roll", a multi-act show held at Olympia Stadium in Detroit, MI on Halloween night, 10/31/1969.
 
Acts/bands listed include (the Crazy World of) Arthur Brown, Dr. Timothy Leary, Frost, MC5, Ralph Adams, Peter Hurkos, the Amboy Dukes (featuring Ted Nugent), Bonzo Dog Band, the Stooges (featuring Iggy Pop), Coven, Pink Floyd, Savage Grace, Kim Fowley, Alice Cooper, Sky, Teegarden & Vanwinkle, "Satan", SRC, Frut, Bob Seger, All the Lonely People and the Pleasure Seekers (featuring Suzi Quatro). *For a list of who actually appeared, see the link at the bottom of the page.
Apparently the advertising for this show was not even close to who actually played. While a number of the acts listed on the poster (including all of the English bands- Crazy World of Arthur Brown, Pink Floyd and Bonzo Dog Band) did not appear, a few (mostly local bands) played at the event (*from Glen Buxton's website (Alice Cooper);
 
Art by Linz, image is # 138 in the Russ Gibb Presents/Grande series (event was co-promoted with Mike Quatro) and is featured in the Art of Rock book on page 301 (plate 3.147). 
 
The postcard is in good condition; there is a bit of surface rubbing/smudging and a few light scratches.  Also a couple of tiny corner bends, and a few tiny smudges on the reverse.