Ditunjukkan sekarang: Bulgaria - Setem-setem bayaran pos (1930 - 1939) - 3 Setem-setem.
9. May WM: Tiada Perforasi: 11½
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![[Exhibition of Airmail Postage Strasbourg - Airplane over City, jenis DK]](https://www.stampworld.com/media/catalogue/Bulgaria/Postage-stamps/DK-s.jpg)
![[Exhibition of Airmail Postage Strasbourg - Airplane over City, jenis DK1]](https://www.stampworld.com/media/catalogue/Bulgaria/Postage-stamps/DK1-s.jpg)
![[Exhibition of Airmail Postage Strasbourg - Airplane over City, jenis DK2]](https://www.stampworld.com/media/catalogue/Bulgaria/Postage-stamps/DK2-s.jpg)
