Stamps of North Korea, Silkworm Research issue
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postage
1991, Mar 27 Silkworm Research issue unwmk p. 12.25 (6 stamps)
| - | 10ch | multi | Dr. Kye Ung Sang | .20 | ||
| - | 20ch | multi | Antheraea pernyi | .20 | ||
| - | 30ch | multi | Attacus ricini | |||
| - | 40ch | multi | Antheraea yamamai | |||
| - | 50ch | multi | Bombyx mori | |||
| - | 60ch | multi | Aetias artemis |
1 to 6 of 6