Statele Unite (SUA)
Prezentat acum: Statele Unite (SUA) - Timbre poştale (1847 - 2024) - 1 timbre.
1983
American Inventors
21. Septembrie WM: Niciunul Perforare: 11
![[American Inventors, Tip ]](https://swmedia-4cd6.kxcdn.com/media/catalogue/United-States/Postage-stamps/1805-b.jpg)
| Nr. | Tip | D | Culoare | Descriere |
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| 1805 | BDO | 20C | portocaliu/negru | Charles Steinmetz, 1865-1923, and Curve on Graph | (48 mill) | 0,27 | - | 0,27 | 0,81 | USD |
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| 1806 | BDP | 20C | portocaliu/negru | (48 mill) | 0,27 | - | 0,27 | 0,81 | USD |
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| 1807 | BDQ | 20C | portocaliu/negru | (48 mill) | 0,27 | - | 0,27 | 0,81 | USD |
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| 1808 | BDR | 20C | portocaliu/negru | (48 mill) | 0,27 | - | 0,27 | 0,81 | USD |
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| 1805‑1808Er | Black omitted | 433 | - | - | - | USD |
