Michiel Theobald Gloeckner (German-American, 1915-1989), four large prints, including: two copies of "Untitled I", 1974, lithograph, depicting abstract geometric composition, both pencil signed and dated lower right, ed. 68/100 and 80/100, "Michel Casse Litho Paris" blind stamp lower left, minor toning to margins, each 25 1/2" h. x 21 1/2" w.; "Galerie 5" poster and separate print of the image used for the poster, 1973, signed in print lower right, wear consistent with age, including heavy toning and staining to margins of both, poster: 25 1/2" h. x 21 1/4" w.