Switzerland: 1931, 1. South America flight, handing in for transport Friedrichshafen to Rio de Janeiro, cover with english franking from LONDON 18.8. To Zurich, there redirected with Swiss franking and stamp Zurich FRAUMÜNSTER 24.8. Via FRIEDRICHSHAFEN 29.8. With 4 RM and 1 RM Zeppelin to Rio de Janeiro transported, addressed to New York, cover and stamp in perfect condition, detailed photo expertize court judge