After a look in the right book, I can tell you, that it is a Horch 8 Typ 375 Roadster-Coupé from 1931 with bodywork by Alexis Kellner. Since Kellner was liquidated in 1930 and bought by Drauz afterwards, I now understand why the coachbuilders emblem is triangle shaped. I think the original Kellner emblem had a different shape.