The 540K was the more powerful successor to the 500K. It was offered with different bodywork versions of which the Convertible B was by far the most popular variant.
In terms of appearance, it was difficult to distinguish from the 500K, depending on variant and model year. 419 units were produced from 1936-1939.

8-cylinders 5401cc, 115-horsepower (180 with Kompressor) @ 3400 RPM, 170 km/h top speed