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1918 2 air-mail letters with franked with sets FLUGPOST, the first with 1,5K-4K grey paper and postage 3 + 12h, CDS CRACOW 4.VI. 18 to Vienna with arrival WIEN 5.VI.; second with 1,5K-4K white paper and postage stamp 15h LEMBERG 24.VII.18, arrival WIEN 25.VII ; 1x vertical fold, both exp. by Ferchenbauer U:A5
1918 2 air-mail letters from Vienna to Lviv, April 1918, with exact frankings 15h and 4 K; very fine, exp. Wallner and Ferchenbauer U:A5
1918 FIRST FLIGHT / letter with sets FLUGPOST 1,5K-4K grey paper and postage stmp stmp 15h, cancel. CRACOW 31. III. 18, to Vienna - so-called. VERSUCHTER ERSTFLUG (pokusný first flight) without arrival postmark (see. Ferchenbauer. II. part page. 342); perfect condition, exp. by Ferchenbauer.., c.v.. 550€ doesn't picture rarity this letter; it is worldwide at all first flight regular post. line! U:A5
