Switzerland 1920 (24. 11. ), flight Frankfurt - Lörach / Switzerland on Zeppelin-PK from Berlin 23. 11. 20. from november 1920 are only approximate 9 air mail cards recorded, of it 6 with the first flight from, 14. 11. very rare. Auführliches certificate Ruoss
http://ift.tt/1yKJDoT Selected Collecting
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