06/30/2015. Remarks by Kees Kort: "After the successful quantity production of the Rieseler designed R.III and R.IV by the Abteilung Flugzeugbau (Aircraft Section) of the steel construction company Stahlwerk Mark at Breslau the partners soon separated. Walter Rieseler went his own way, leaving Stahlwerk Mark without a designer. After having found a new designer they continued with designs that were improved Rieseler designs, like the ME.I and ME.II. The identification stood for Mark Eindecker (Mark monoplane) based on the parasol wing designs of Rieseler. They also diversified in sport flying in 1925, producing the MS.I and MS.II, where the identification stood for Mark Sportflugzeug (Mark Sport airplane).

The two-seater biplane MS.II was a complete departure from the Rieseler designed parasol monoplanes. These factory pictures show the MS.II b version which was fitted with a 70 hp Siemens-Halske Sh 10 five-cylinder engine, which was license-built by Stahlwerk Mark as the M 5. Of mixed wood and steel construction, the biplane had characteristic N-form wing struts, and interconnected ailerons on the upper and the lower wing. Commercially the MS.II did not do very well, only two examples can be found in the early German civil register: D-800 and D-998.

The Stahlwerk Mark - Abteilung Flugzeugbau closed it doors in 1927."