America flight 1931, Postal service reception Lisbon, board mail 30.1, letter with 4 x 50 Pfg and block of four 1 Mk airmail each with on board confirmation mark, both flight stamp on face, transit Rio 22. VI. 31 reverse, further to New York in the flying boat transported with reverse 2 C as postage stamps added to cover to pay postage due for the domestic transport from New York 25.9.31, superb