This was effectively a four-door cabriolet, although the hood was of rather a thin material and basic structure when compared to the 170 cabriolets of the 1930. It was a requirement that all the cars should be painted in "Police Green", but in the end most of the cars delivered to the police were painted blue. Although the car was provided only for the use of official bodies, it incorporated several technical and other features, including for the first time on a 170 car a trunk/boot accessible from the outside via a hinged lid, which soon afterwards appeared on other upgraded W136s.