| Name | Issues/Designs | |||
| Safe Motherhood South Asia Conference | 1990 | — | - Pakistan | |
| 19th Universal Postal Congress | 1984 | — | - Gabon | |
| 20th Universal Postal Congress | 1989 | — | (2) - Uni..tes, 20th UPU Congress (Monaco) syns. 20th UPU Congress | |
| Universal Postal Union Congress 1984 | 1984 | — | (17) - Samoa, Gambia, Virgins, ... | |
| 34th World Advertising Congress | 1994 | — | - Mexico | |
| 1st World Anti-Communist League Conference | 1967 | — | - Korea | |
| 10th World Anti-Communist League Conference | 1977 | — | - Chi..ROC | |
| 31st World Apiculture Congress | 1987 | — | - Poland | |
| 12th World Architects' Congress | 1978 | — | - Mexico | |
| 24th World Congress of Dermatology | 2019 | — | - Italy | |
| World Summit for Children | 1990 | — | syns. World Summit on Children, New York |