Now showing: Czechoslovakia - Postage stamps (1918 - 1992) - 1 stamps.
9. duben WM: Žádný Engraving: F. Hudeček Perforation: 11½
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![[Defence Exhibition, type OS]](https://swmedia-4cd6.kxcdn.com/media/catalogue/Czechoslovakia/Postage-stamps/OS-s.jpg)
![[Defence Exhibition, type OT]](https://swmedia-4cd6.kxcdn.com/media/catalogue/Czechoslovakia/Postage-stamps/OT-s.jpg)
![[Defence Exhibition, type OU]](https://swmedia-4cd6.kxcdn.com/media/catalogue/Czechoslovakia/Postage-stamps/OU-s.jpg)
