3. South America flight 1932, registered letter from San Marino 14.4. With 1 and 7, 70 L landscapes in colourful Michel F to Recife, despite forwarding mark \"connection flight. \" direct to Friedrichshafen routed with transit 18.4. And flight stamp on face, arrival Recife 20.4, personally on face signed from commander Hugh Eckener, superb, the only from Eckener signed document, depicted in the Longhi catalogue, signed and photo expertize Longhi International Association for Philatelie Experts\". Raro aerogrammo\" (Longhi 96, 2.800 Euro)