Dams
| Country: | Italy |
| Quality: | MNH |
| Year of issue: | 1981 |
| Michel number: | 1757-1758 |
Dams
| Country: | Ciskei |
| Quality: | MNH |
| Year of issue: | 1989 |
| Michel number: | 149-152 |
1977
| Country: | Belgium |
| Quality: | FDC |
| Year of issue: | 1977 |
| Michel number: | 1905-1906 |
Dams
| Country: | Congo, Democratic... |
| Quality: | MNH |
| Year of issue: | 1973 |
| Michel number: | 470-472 |
Agriculture
| Country: | Mali |
| Quality: | MNH |
| Year of issue: | 1980 |
| Michel number: | 799 |
Dams
| Country: | Gabon |
| Quality: | MNH |
| Year of issue: | 1966 |
| Michel number: | 250 |
Dams
| Country: | Brazil |
| Quality: | MNH |
| Year of issue: | 1972 |
| Michel number: | 1312-1315 |
Dams
| Country: | France |
| Quality: | MNH |
| Year of issue: | 1966 |
| Michel number: | 1566 |
Sun and stars
| Country: | Uruguay |
| Quality: | MNH |
| Year of issue: | 1966 |
| Michel number: | 1026 |
Dams
| Country: | Brazil |
| Quality: | MNH |
| Year of issue: | 1989 |
| Michel number: | 2317 |
Crests / heraldry / symbols
| Country: | Germany, Democratic... |
| Quality: | MNH |
| Year of issue: | 1973 |
| Michel number: | 1862-1866 |
Water
| Country: | Liberia |
| Quality: | MNH |
| Michel number: | 152 |
Technology / Technology development
| Country: | Luxembourg |
| Quality: | MNH |
| Year of issue: | 1964 |
| Michel number: | 693-695 |
Sun and stars
| Country: | Turkey |
| Quality: | MNH |
| Year of issue: | 1991 |
| Michel number: | 2934 |
Water
| Country: | Pakistan |
| Quality: | MNH |
| Year of issue: | 1971 |
| Michel number: | 304 |
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