http://www.invaluable.co.uk/auction-lot/1931-hungary-return-flight-to-budapest,-franked-5-337-c-fbb46ecab31931 Hungary return flight to Budapest, franked 50f Air + 1p & 2p Zeppelin set, obverse bears green Zeppelin cachet, reverse bears Miskolez c.d.s. & Friedrichshafen c.d.s, also 1931 round Budapest Zeppelin flight card franked 10f on 16f (SG.528) + 1p Zeppelin stamp (SG.529), tied Budapest c.d.s's, underneath Debrecen c.d.s (where mail was dropped) + large blue Zeppelin cachet. (2)
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