4. South America flight 1933, business letter from Worms 4.8. To Rio with meter cancellation \"Cornelius Heyl A. G. \" and 150 Pfg postage, small part the reverse flap is absent, transit Friedrichshafen 5.8, flight stamp on face, arrival Rio 9.8. And promotional L4 \"Responda logo. \", scarce commercial mail