| Name | Issues/Designs | |||
| 12th International Great Dams Congress | 1976 | — | - ... | |
| 11th International Leprosy Congress | 1978 | — | - ... | |
| 4th International Numismatics Convention | 1976 | — | - ... | |
| 34th World Advertising Congress | 1994 | — | - ... | |
| 12th World Architects' Congress | 1978 | — | - ... |