| country | year | Yvert | mint | used | |||||
|---|---|---|---|---|---|---|---|---|---|
| Wilhelm Conrad Röntgen | |||||||||
|
mechanical engineer, physicist; Nobel prize, 1901 | España | 1967 | 1443 |
0.50€
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|
Lennep, 1845 - München, 1923 | Česko | 1995 | 91 |
0.50€
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