Stamps of Czechoslovakia, 20 base day
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postage
1933, Jun 20 Christianity introduction 1100th issue unwmk p. 9.75
| X | 50h | grn | St. Emmeram's Cathedral, Nitra | |||
| X | 1k | car | St. Emmeram's Cathedral, Nitra from gate |
1935, Oct 20 p. 12.5
| X | 1k | roselake | Masaryk | — | — |
1937, Sep 20 Masaryk memorial issue
| X | 2k | blk | Masaryk |
1947, Jul 20 World Youth Festival 1947 issue
| X | 1.20k | brnvio | ||||
| X | 4k | graybl |
1948, Jun 20 Kromeriz assembly 100th issue
| X | 1.50k | grayblk | FPalacký a FLRieger | |||
| X | 3k | FPalacký a FLRieger |
1949, May 20 UPU 75th issue
| X | 3k | stagecoach & train | ||||
| X | 5k | graybl | ||||
| X | 13k | graygrn |
1949, Aug 20
| X | 1.50k | dkbrn | globe & ribbon | |||
| X | 5k | ultra | globe & ribbon |
1951, Jan 20 p. 14.25x14
| - | 2k | dkbl | Picasso dove | |||
| - | 3k | Picasso dove |
1955, Jan 20 1st Spartacist Games issue p. 11.25x11.5
| X | 30h | red | woman holding torch | |||
| X | 45h | ski jumper |
1955, Jul 20 5th World Youth Festival issue p. 11.5
| X | 60h | Girl & Boy of two races |
1956, Feb 20 2nd 5-Year Plan issue (5 stamps)
| X | 5h | viobrn | hydro plant | |||
| X | 10h | blk | mining | |||
| X | 25h | Building construction | ||||
| X | 30h | dkgrn | harvester | |||
| X | 60h | dkultra | Metallurgical plant K Gottwald at Ostrava |
1956, Sep 20 natural resources
| X | 30h | harvesting grapes | ||||
| X | 35h | Women gathering hops | ||||
| X | 80h | dkbl | fishing | |||
| X | 95h | brn | logging |
1957, Dec 20 IGY issue
| X | 30h | radio telescope & observatory, p. 11.5x11.25 | ||||
| X | 45h | Lomnicky Stit Meteorological Station | ||||
| X | 75h | Sputnik 2 over Earth, p. 11.5x11.25 |
1958, Jun 20 Communist Postal Ministers Congress issue p. 11.25x11.75
| X | 30h | Telephone operator | ||||
| X | 45h | Aerial Mast |
1958, Aug 20 portraits (1958)
| X | 30h | red | Julius Fucik | |||
| X | 45h | blvio | Gustav K. Zechenter | |||
| X | 60h | Karel Čapek | ||||
| X | 1.40k | blk | Svatopluk Čech |
1958, Aug 20 Max Svabinsky 85th issue p. 14
| X | 1.60k | blk | The Poet and the Muse - Max Svabinsky |
1959, Jul 20 Brno Fair 1959 issue p. 11.75x11.25
| X | 30h | multi | view | |||
| X | 60h | multi | Fair Emblem and World Map | |||
| X | 1.60k | multi | Z Pavilion |
1960, Jan 20 2nd Winter Spartacist Games issue p. 11.25x11.75
| X | 30h | dpsal & dkbrn | gymnast | |||
| X | 60h | multi | skier | |||
| X | 1.60k | multi | basketball players |
1961, Jan 20 3rd 5-year plan issue
| X | 20h | bl | rolling mill | |||
| X | 30h | ver | turbine generator | |||
| X | 60h | grn | ditch-digging machine |
1961, Jun 20 puppets (1961)
| X | 30h | red & yel | Maňásek doll | |||
| X | 40h | sep & ltblgrn | Dr. Faustus and Caspar | |||
| X | 60h | multi | Spejbl and Hurvinek | |||
| X | 1k | multi | Difficulties with the moon |
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