Heinz Hajek-Halke: Das Modell. 1957, Vintage silver print, ferrotyped, 15-7/8 x 11-3/4 in. (404 x 300 mm), unmounted, estate stamp on reverse, annotated #1 of an edition of 6., Illustrated: H. Hajek-Halke: Form aus Licht und Schatten, Gottingen 2005, page 208 (variant). w1128j.