I'd like to object here. The puzzle picture is identified as a „BMW 315 2+2 Roadster, 1935“ in Benter/Schrader: Deutsche Automobil-Karosserien, and as a cca 1935 BMW 315/1 built for Fürst von Wrede in Eckermann: Auto und Karosserie. Weinberger built quite a few similar bodies on BMW 303, 315 and 319 chassis, differing in details (fender skirts, door handles etc).