Air Mail cover 1924 (9 June) Romanshorn to Zurich card bearing special vignette, 1926 (Nov.) Zurich to Alexandria cover with cachet, 1930 (21 Apr.) Swiss flight card, 1930 (14 Sept.) Geneva flight cover and 1931 (May) Ostsee flight cover with Lübeck d.s. on reverse. (5)
Air Mail cover 1924 (9 June) Romanshorn to Zurich card bearing special vignette, 1926 (Nov.) Zurich to Alexandria cover with cachet, 1930 (21 Apr.) Swiss flight card, 1930 (14 Sept.) Geneva flight cover and 1931 (May) Ostsee flight cover with Lübeck d.s. on reverse. (5)
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