French
| Country: | Central African Republic |
| Quality: | MNH |
| Year of issue: | 2015 |
| Michel number: | bl 1364 |
French
| Country: | Central African Republic |
| Quality: | MNH |
| Year of issue: | 2015 |
| Michel number: | ark 5710-5713 |
Dogs
| Country: | Switzerland |
| Quality: | FDC |
| Year of issue: | 1989 |
| Michel number: | 1387-1389 |
Writers / Poets
| Country: | Switzerland |
| Quality: | Max Card |
| Year of issue: | 1981 |
| Michel number: | 1191-1195 |
Writers / Poets
| Country: | Switzerland |
| Quality: | FDC |
| Year of issue: | 1981 |
| Michel number: | 1191-1195 |
Medicine
| Country: | Bulgaria |
| Quality: | MNH |
| Year of issue: | 2005 |
| Michel number: | bl 278 |
Jobs / Workers
| Country: | Germany, Federal... |
| Quality: | First Day Cover |
| Year of issue: | 1986 |
Optics
| Country: | United Kingdom of... |
| Quality: | MNH |
| Year of issue: | 1984 |
| Michel number: | 993-996 |
Education
| Country: | Burundi |
| Quality: | MNH |
| Year of issue: | 1970 |
| Michel number: | 657-660 |
Weights and Measures
| Country: | Germany, Federal... |
| Quality: | First Day Cover |
| Year of issue: | 1981 |
Optics
| Country: | Berlin |
| Quality: | First Day Cover |
| Year of issue: | 1981 |
Optics
| Country: | Germany, Democratic... |
| Quality: | MNH |
| Year of issue: | 1989 |
| Michel number: | 3252-3253 |
Technology / Technology development
| Country: | Germany, Democratic... |
| Quality: | MNH |
| Year of issue: | 1980 |
| Michel number: | 2534-2537 |
Astronomy
| Country: | Germany, Democratic... |
| Quality: | MNH |
| Year of issue: | 1967 |
| Michel number: | 1254-1255 |
Medicine
| Country: | Tunisia |
| Quality: | MNH |
| Year of issue: | 1974 |
| Michel number: | 831 |
Nobel Prize
| Country: | Germany, Federal... |
| Quality: | Cancelled |
| Year of issue: | 2005 |
| Michel number: | abo 2496 |
Optics
| Country: | Italy |
| Quality: | FDC |
| Year of issue: | 1983 |
| Michel number: | 1821 |
Medicine
| Country: | Egypt |
| Quality: | MNH |
| Year of issue: | 1958 |
| Michel number: | 529 |
Optics
| Country: | Switzerland |
| Quality: | MNH |
| Year of issue: | 2003 |
| Michel number: | ZF |
Famous people
| Country: | Switzerland |
| Quality: | MNH |
| Year of issue: | 1978 |
| Michel number: | 1139 |
Art
| Country: | Switzerland |
| Quality: | MNH |
| Year of issue: | 2010 |
| Michel number: | 2164-2166 |
Optics
| Country: | Germany, Federal... |
| Quality: | MNH |
| Year of issue: | 2020 |
| Michel number: | 3536 |
Optics
| Country: | Pakistan |
| Quality: | MNH |
| Year of issue: | 1969 |
| Michel number: | 283 |
Optics
| Country: | Germany, Federal... |
| Quality: | Cancelled |
| Year of issue: | 2003 |
| Michel number: | vie 2332 |
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