Topic renamed and replaced Edo's attachment with higher-res copy, find credited to Justo Miranda at SPF.
Some additional pics of the reconnaissance / artillery-spotter variant and another variant without an open frame (Kyrill von Gersdorff, Kurt Knobling: Hubschrauber und Tragschrauber – Die deutsche Luftfahrt Bd. 3, Bernard & Graefe Verlag München, 1982), find credited to Richard at SPF: