3. South America flight 1931, card from Vatican 14.10. With 25 C coat of arms as regular card franking, transit Rome 14.5. With 1 L special stamp, further with airmail via Basle with transit 16.10. To Friedrichshafen with 2 x 1 RM Polar travel as German board mail with on board confirmation mark 18.10. In very rare three-country Michel F, flight stamp on face, forwarding mark \"to Bahia\", excellent condition, extreme rare document in excellent condition, Longhi \". Very few covers and cards known\" (Longhi 76 K, approximate 20.000 Euro)