Stamps of Czechoslovakia, 2 Apr 1951
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airmail
1951, Apr 2 Spas 1951 issue unwmk p. 13.75
| - | 6kc | grayol | plane over Karlovy Vary | |||
| - | 10kc | brnvio | plane over Piestany | |||
| - | 15Kc | dkultra | plane over Marianske Lazne | |||
| - | 20kc | dkbrn | plane over Sliač |
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