Luxembourg: 1936, 1. North America flight, handing in for transport Frankfurt with confirmation stamp "c", registered cover from LUXEMBOURG 29.4. with pair 1 3 / 4 Fr. airmail and D. Reich 50 Pfg. and 75 Pfg. Zeppelin with stamp FRANKFURT 2.5. to the United States, 50 Pfg. value round corner and slightly blotched, otherwise superb