Helderse Postzegelhandel : Stamps for sale - Czechoslovakia
Now showing: Czechoslovakia - Postage stamps (1918 - 1992) - 1 stamps.
1957
International Geophysical Year - Showing Globe and Dated 1957-1958
20. December WM: None Design: F. Hudeček Perforation: 11½ x 11¼
![[International Geophysical Year - Showing Globe and Dated 1957-1958, type SI]](https://swmedia-4cd6.kxcdn.com/media/catalogue/Czechoslovakia/Postage-stamps/SI-s.jpg)