Bidspirit auction | Maritime Mail. Letter with letterhead

Maritime Mail. Letter with letterhead from the National Navigation Company, to Lisbon, postage of 40 centavos, (4 stamps of 10 centavos from the 1940 Portuguese World Exhibition), obliterated with the stamp of the liner S. Thomé “National Navigation Company/ NRP S, Thomé/Lisbon”, and dated April 12, 1941.