Based on the SSW D.IV, but with larger wings (+ reinforcements), changing of the empennage outline and the use of a high altitude propellor. It never flew though, as during ground testing the wing construction appeared too delicate for a safe flight. This frame is the only example that's left on the planet, after being partly restored in the late 90's.

This is a fascinating exhibit at the Polish Aviation Museum, unfortunately preserved without wings. The aircraft was modified to this form from a Siemens-Schuckhert DV.1 123 of which were built around 1918. The DV.1 had a very good performance but arrived too late and in too small numbers to affect the balance of air power in the late stages of WW I. It first flew in the form here in 1926.