These two Polish air mail postage stamps, both overprinted with "Challenge 1934" in red, were issued to commemorate the International Air Tournament held in that year. Images depicted on the stamps are as follows:
Airplane over Warsaw - 20 gr (Polish grosz)
Zwirko (pilot) and Wigura (aircraft designer) - 30 gr
Issue date: August 28, 1934
Print run: 222,300
Mint, never hinged condition.
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