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1918 Ferch.225-227, ERSTFLUG CRACOW - WIEN, airmail letter with airmail issue and postage stamps 15+15h 1916, from that 2,50 K perforation 12½ :11½, posting CRACOW 1 / 1.IV.18, arrival FLUGPOST WIEN 1 / 3.IV.18; very fine, cat. min. 800€ U:A5
1918 Ferch.225-227, air-mail letter from Vienna to Cracow with airmail issue and postage 3+12h 1916, from that 2,50 K perforation. 12½ -11½, CDS WIEN 17.IV.18; cat. min. 375€ U:A5
1918 Ferch.225-227, "air-mail letter" with complete airmail issues and postage stamp 20h 1916, from Lviv to Vienna, arrival postmark FLUGPOST WIEN 1 / 17.10. 18; very fine, interesting entire transported by train U:A5