Poland
1.9 - 2.3$
price on 08.10.2022
Overprinted "Challenge 1934" in red.
Overprint - Typography
Overprint - Typography
| Country: | Poland |
| Type: | Postage stamps |
| Series: | Int. Air Tournament |
| Nominal: | 30 gr |
| Year: | 1934 |
| Material: | white thick smooth |
| Perforation: | Various |
| Mintage: | 2,080,750 |
Int. Air Tournament
 Airplane over Warsaw - Overprinted 3.4$ |  Zwirko (pilot) and Wigura (aircraft designer) - Overprinted 1.9$ |