| Name | Issues/Designs | |||
| 64th Esperanto Congress | 1979 | — | - ... | |
| International Congress of Mathematicians 1994 | 1994 | — | - ... | |
| 24th Universal Postal Congress | 2008 | — | - ... syns. Universal Postal Union Congress 2008, 24th UPU Congress | |
| 25th Universal Postal Congress | 2012 | — | - ... |