Erik Boeré Philatelie : 待售邮票 - 捷克斯洛伐克
现在展示: 捷克斯洛伐克 - (通用)邮票 (1918 - 1992) - 2 邮票.
1957
The 250th Anniversary of Polytechnic Engineering Schools, Prague
25. 五月 窗口管理器: 空缺 筛孔: 11½
![[The 250th Anniversary of Polytechnic Engineering Schools, Prague, 类型 RF]](https://swmedia-4cd6.kxcdn.com/media/catalogue/Czechoslovakia/Postage-stamps/RF-s.jpg)
1957
The 250th Anniversary of Polytechnic Engineering Schools, Prague
25. 五月 窗口管理器: 空缺 筛孔: 11½
![[The 250th Anniversary of Polytechnic Engineering Schools, Prague, 类型 RF]](https://swmedia-4cd6.kxcdn.com/media/catalogue/Czechoslovakia/Postage-stamps/RF-s.jpg)