1937. In February of that year, the new Mercedes-Benz “320” model was unveiled for the first time at the Berlin Auto Show, replacing its predecessor, the “290” model. Externally, the “320” Mercedes models were very similar to their predecessors; the only differences between the two- and four-door convertibles were the streamlined shape of the rear section and the split windshield. These cars were equipped with an improved 6-cylinder engine with a displacement of 3.2 and 78 ZS of power. To compensate for the decline in fuel quality—rather than to increase power—the engine’s displacement was increased to 3.4 liters in early 1938. However, the model designation remained the same—”320″—instead of the logically expected “430.” Compared to the MB-290 models, the MB-320 featured the following additional changes: the chassis and frame were slightly modernized, a 6-cylinder inline engine with increased displacement (3.2 liters) was installed, and a 4-speed transmission was installed for the first time. The Mercedes-Benz 320 convertible models were available in three versions, designated by the letters “A,” “B,” and “D.” The sports version of the convertible—the MB 320A Sport Roadster—was relatively expensive. The MB 320B cabrio had two doors, four windows, and front and rear seats. The third variant is the MB 320D convertible, with four doors, four windows, and front and rear seats.
