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Found at last! Looks like 1932 Adler Primus Cabriolet!
https://en.wikipedia.org/wiki/Adler_Primus
http://fotoarchiv-kunkel.startbilder.de/1200/adler-primus-cabrio-2-tueren-298478.jpg
http://racem.org/wp-content/uploads/parser/Adler-primus-2.jpg
http://www.imcdb.org/vehicles_make-Adler_model-Primus.html