Stamps of Sierra Leone, 11 base day
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postage
1964, May 11 John F. Kennedy memorial issue map of Sierra Leone unwmk (7 stamps)
1986, Mar 11 100th Anniversary of Statue of Liberty issue p. 14 (5 stamps)
| - | 40c | multi | Times Square 1905 | |||
| - | 70c | multi | Times Square 1986 | |||
| - | 1le | multi | Tally Ho Coach c 1880 | |||
| - | 10le | multi | Liberty Lines express bus 1986 | |||
| - | 12le | multi | — | — |
1987, Sep 11 500th Anniversary of Discovery of America (1992) issue p. 14.25 (5 stamps)
1989, Sep 11 butterflies (1989 Sierra Leone) p. 14 (10 stamps)
1990, May 11 World Cup 1990 issue - team photos p. 13.75 (23 stamps)
| - | 15le | multi | Colombia soccer team | — | — | spelled Columbia |
| - | 15le | multi | United Arab Emirates soccer team | — | — | |
| - | 15le | multi | South Korea soccer team | — | — | |
| - | 15le | multi | Cameroun soccer team | — | — | |
| - | 15le | multi | Costa Rica soccer team | — | — | |
| - | 15le | multi | Romania soccer team | — | — | |
| - | 15le | multi | Yugoslavia soccer team | — | — | |
| - | 15le | multi | Egypt soccer team | — | — | |
| - | 30le | multi | Netherlands soccer team | — | — | |
| - | 30le | multi | Uruguay soccer team | — | — | |
| - | 30le | multi | Ussr soccer team | — | — | |
| - | 30le | multi | Czechoslovakia soccer team | — | — | |
| - | 30le | multi | Scotland soccer team | — | — | |
| - | 30le | multi | Belgium soccer team | — | — | |
| - | 30le | multi | Austria soccer team | — | — | |
| - | 30le | multi | Sweden soccer team | — | — | |
| - | 45le | multi | W Germany soccer team | — | — | |
| - | 45le | multi | England soccer team | — | — | |
| - | 45le | multi | United States soccer team | — | — | |
| - | 45le | multi | Ireland soccer team | — | — | |
| - | 45le | multi | Spain soccer team | — | — | |
| - | 45le | multi | Brazil soccer team | — | — | |
| - | 45le | multi | Italy soccer team | — | — |
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