There is a Duesenberg Willoughby sedan, veteran of many films, in the 1941 Fritz Lang movie Man Hunt. The car is notable in a couple of scenes and you can even hear it growl through it's open exhaust cut-out. Walter Pidgeon stars as an English sportsman hunting in Germany just prior to WW 11, who by a quirk, ends up with Adolph Hitler in his sights. He thinks about it but does not take the shot. A group of German soldiers soon captures him. A pretty good movie all things considered. Other notables include: George Sanders, John Carradine and a very young Roddy McDowall.

Thanks!

http://www.imcdb.org/movie_33873-Man-Hunt.html