Now showing: Poland - Postage stamps (1860 - 2024) - 2 stamps.
12. prosinec WM: Žádný Sheetsize: 100 Design: R. Kleczewski Perforation: 12½ x 12¾
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![[World Peace Congress in Vienna, Austria, type OS1]](https://www.stampworld.com/media/catalogue/Poland/Postage-stamps/OS1-s.jpg)
![[World Peace Congress in Vienna, Austria, type OS]](https://www.stampworld.com/media/catalogue/Poland/Postage-stamps/OS-s.jpg)
