Even though this car is part of the Nurburg lineup, it didn't carry over the name in the automaker's official listings, but it was commonly used due to naming confusion.

During his work for Mercedes-Benz, Ferdinand Porsche developed the Nurburg lineup, also known as the W08, which was available in a few body shapes but, most importantly, as a sedan.

Mercedes-Benz introduced the W08 lineup in 1928, and it was the first car offered by the German carmaker with an inline-eight powerplant, and the Sport Roadster was a one-of-a-kind example.

Ferdinand Porsche worked for Mercedes-Benz when he developed a few vehicles, such as the Nurburg lineup or W08, and the Cabriolet D was part of that range of vehicles.

The Nurburg was the last vehicle developed by Ferdinand Porsche while he worked for Mercedes-Benz, a range of cars that included the rare Cabriolet C version.