Chicago flight 1933, stage to Rio, letter from San Marino 7.10. To Buenos Aires with among others 7, 70 and 9 L. Landscapes in colourful Michel F, flight stamp on face, various transits and arrival Buenos Aires 19.10. Reverse, superb, signed and photo expertize Longhi \". Raro aerogramma\" (Longhi 821, 3.000 Euro)