1930 - 1935, lot better issues - all with photo expertize / photo expertize H. D. Schlegel BPP (2018), mostly restrictions, as well and on unused International Postage Stamp Exhibition souvenir sheet, Chicago travel unused as well 3 documents, Polar travel always as correctly franked, South America flight always as a single franking, Ostropa souvenir sheet used, Michel 6.430.-