Double Duck Mystery Phaeton (update: the "Toast-rack Tourer" ?)

We thought we knew all about Donald Duck's cars. We all know his adventures with the 1934 Belchfire Runabout "313", earlier described on these pages (somebody even built a 3D lifesize tribute). But than we received this postcard from historian Frans Vrijaldenhoven showing the Duck family on its way to a party. Keeping in mind Donald's limited income we concluded this must be a borrowed motorcar from his filthy rich uncle Scrooge. But among the many fine limousines employed by him no double cowl Phaeton is to be found.  Quite possible that it is a one-off built for the Duck family by Pennock in Holland?  Can any of you help trace back the heritage of the car.