Paul Wunderlich Phantastischer Realismus MICHAEL WYMAN GALLERY CHICAGO NO ANGEL

I'm not sure what I have here, a poster or a print or a lithograph. The picture is in good shape, but the frame has some damage on back and two corners. I did some research and figured out he did a show at the Michael Wyman Gallery in 1975. So this could be a poster for the show or ???? Frame is 35 1/2 x 23 1/2 inches.