Wereld FDC's, brieven enz. in enveloppen World FDC's, covers etc. in envelopes
ZWITSERLAND, speciale vluchten vanaf 1924 incl. betere ballonvluchten en helikoptervluchten, ook vignetten gebruikt w.o. Service Aeriën, 80c meeting Internationaal driehoekzegel op poststuk, Zeppelin poststuk etc., totaal ca.70 poststukken, in envelop
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