Airship Graf Zeppelin, 17.10.1929, Balkan Flight, mail drop Sofia. Postcard surcharge due to lack of franking. The card was written personally by head machinist Wilhelm Fischer, real used. (Fischer saved the airship in Sevilla)
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Airship Graf Zeppelin, 17.10.1929, Balkan Flight, mail drop Sofia. Postcard surcharge due to lack of franking. The card was written personally by head machinist Wilhelm Fischer, real used. (Fischer saved the airship in Sevilla)

Source: philasearch.com