The 23rd International Geological Congress, Prague 1968
Now showing: Czechoslovakia - Postage stamps - 1968 - The 23rd International Geological Congress, Prague - 5 stamps.
1968
The 23rd International Geological Congress, Prague
8. August WM: None Design: Lukavský Jaroslav Engraving: Housa Bedřich Perforation: 11½
![[The 23rd International Geological Congress, Prague, type AVH]](https://www.stampworld.com/media/catalogue/Czechoslovakia/Postage-stamps/AVH-s.jpg)
![[The 23rd International Geological Congress, Prague, type AVI]](https://www.stampworld.com/media/catalogue/Czechoslovakia/Postage-stamps/AVI-s.jpg)
![[The 23rd International Geological Congress, Prague, type AVJ]](https://www.stampworld.com/media/catalogue/Czechoslovakia/Postage-stamps/AVJ-s.jpg)
![[The 23rd International Geological Congress, Prague, type AVK]](https://www.stampworld.com/media/catalogue/Czechoslovakia/Postage-stamps/AVK-s.jpg)
![[The 23rd International Geological Congress, Prague, type AVL]](https://www.stampworld.com/media/catalogue/Czechoslovakia/Postage-stamps/AVL-s.jpg)
| No. | Type | D | Color | Description |
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| 1806 | AVH | 30H | multicoloured | Adrspach Rocks and Hypophylloceras bizonatum (Ammonite) | (4.810.000) | 0.26 | - | 0.26 | - | USD |
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| 1807 | AVI | 60H | multicoloured | Basalt Columns and Fossilised Frog | (4.690.000) | 0.26 | - | 0.26 | - | USD |
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| 1808 | AVJ | 80H | multicoloured | Bohemian Paradise and Agate | (2.710.000) | 0.26 | - | 0.26 | - | USD |
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| 1809 | AVK | 1Kc | multicoloured | Tatra Landscape and Chlamys gigas Shell | (2.990.000) | 0.53 | - | 0.26 | - | USD |
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| 1810 | AVL | 1.60Kc | multicoloured | Barrandien (Bohemia) and Limestone | (650.000) | 1.59 | - | 0.79 | - | USD |
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| 1806‑1810 | 2.90 | - | 1.83 | - | USD |
