Stamps of Nigeria, 1991
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postage
1991, Mar 20 National Guineaworm Eradication Day issue wmk. mult crown & script CA p. 14
| - | 10k | multi | — | — | ||
| - | 20k | multi | — | — | ||
| - | 30k | multi | — | — |
1991, May 26 Organization of African Unity Heads of State and Governments Meeting, Abuja issue
| X | 20k | multi | .20 | .20 | ||
| X | 30k | multi | — | — | ||
| X | 50k | multi | — | — |
1991, Jul 4 Economic Community of West African States Summit Meeting, Abuja issue
| - | 20k | multi | — | — | ||
| X | 50k | multi | — | — |
1991, Jul 30 Nigerian fish
| - | 10k | multi | Malapterurus electricus | — | — | |
| - | 20k | multi | Lates niloticus | — | — | |
| - | 30k | multi | Tilapia nilotica | — | — | |
| - | 50k | multi | Clarias gariepinus | — | — |
1991, Oct 7 6th World Telecommunication Exhibition issue
| - | 20k | multi | — | — | ||
| - | 50k | multi | — | — |
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