4. South America flight 1934, legitimate company cover to Rio with on both sides colourful Michel F and 285 Pfg postage including 10 Pfg for the transport per pneumatic post to the airport from Berlin 21.7. With minutes cancel and time \"10: 30 V\", further with connection flight to Friedrichshafen, stamps perfin \"E. K. B\", a little patina, flight stamp \"a\", arrival Rio 25.7, scarce commercial mail