[Sergio Luis dos Santos]

Hello Mikael,
Some years ago when I was researching a flight done by some Junkers F 13 to Brasil a friend in Germany found one Nachrichten and sent me a copy. I do not remember from which library or archive it went. I guess best place would be in Germany of course. Maybe you could contact some of the archives listed in this page and ask them about.
http://www.ghi-dc.org/guide13/germarch.html

Good hunting happy dad!