Coreea de Nord
Prezentat acum: Coreea de Nord - Timbre poştale (1946 - 2024) - 1 timbre.
1991
Silkworm Research
27. Martie WM: Niciunul Perforare: 12¼
![[Silkworm Research, Tip ]](https://www.stampworld.com/media/catalogue/North-Korea/Postage-stamps/3304-b.jpg)
| Nr. | Tip | D | Culoare | Descriere |
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| 3304 | DMO | 10Ch | multicolor | Dr. Kye Ung Sang | 0,28 | - | 0,28 | - | USD |
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| 3305 | DMP | 20Ch | multicolor | Antheraea pernyi | 0,56 | - | 0,28 | - | USD |
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| 3306 | DMQ | 30Ch | multicolor | Attacus ricini | 0,56 | - | 0,28 | - | USD |
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| 3307 | DMR | 40Ch | multicolor | Antheraea yamamai | 0,83 | - | 0,28 | - | USD |
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| 3308 | DMS | 50Ch | multicolor | Bombyx mori | 0,83 | - | 0,56 | - | USD |
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| 3309 | DMT | 60Ch | multicolor | Aetias artemis | 1,11 | - | 0,56 | - | USD |
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