Kessler's Car

Most WWII films & series show the German military driving around in 30s style four-door open "convertible" (Mercedes) however, Kessler is chauffered in a 40s style sedan, which I believe to be an Opel Kapitan. As in most cases, pre and post WWII cars were pretty much the same everywhere, so it could just as easily be a 1940 or 1950. Strangely, it does not appear in the IMCDb (movie car database).