4. South America flight 1934, letter from Milan 17.7. With two meter cancel \"S. I. T. I. \" and postage 10, 75 L to Rio de Janeiro, transit Friedrichshafen 21.7. And flight stamp \"c\" on face, arrival Rio 25.7, despite Fold and clearly custom traces remarkable piece, there flawless commercial mail (Longhi 878, 550 Ç)