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postage
1988, Nov 1 40th Anniversary of W.H.O. issue unwmk p. 13.25
| - | 100b | multi | — | — |
1991, Nov 18 National Day 1991 / Industry Year issue
| - | 100b | multi | — | — | ||
| - | 200b | multi | — | — |
2000, Apr 24 butterflies (2000 Oman)
| - | 100b | multi | Colotis danae | — | — | |
| - | 100b | multi | Belenois aurota | — | — | |
| - | 100b | multi | Tarucus rosaceus | — | — | |
| - | 100b | multi | Lampides boeticus | — | — |
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