Now showing: Czechoslovakia - Postage stamps (1918 - 1992) - 1 stamps.
12. May WM: None Design: B. Doleželová Perforation: 11½
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![[The 3rd Trades' Union Congress, type MO]](https://swmedia-4cd6.kxcdn.com/media/catalogue/Czechoslovakia/Postage-stamps/MO-s.jpg)
![[The 3rd Trades' Union Congress, type MP]](https://swmedia-4cd6.kxcdn.com/media/catalogue/Czechoslovakia/Postage-stamps/MP-s.jpg)
