In contemporary records the car was also frequently identified according to the widely used period German generic naming conventions as the “Mercedes-Benz 14/70 PS”, reflecting its “fiscal” and “actual” horsepower respectively.

In addition to the “Tourer” (two-door four-seater cabriolet) body, the car was available as a four-door saloon and a “Pullman Limousine” The straight-six 3444 cc engine was carried over from the W03, delivering 70 PS (51 kW) to the rear wheels through a three-speed gear box controlled via a centrally mounted lever.

Available with a choice of cabriolet bodies, the car, like its six-cylinder sibling, rode on two rigid axles suspended on semi-elliptical leaf springs.

In most respects identical was a version of the car which appeared towards the end of the product run, the 380S (W19) incorporating swing axle rear suspension and a cross mounted leaf spring arrangement at the front.

The car had the same 3820cc side valve 8 cylinder engine as the Mannheim W10 models, but a raised compression ratio supported an increase in maximum power to 85 PS (63 kW; 84 hp).