Stamps of Sierra Leone, 1990
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postage
1990, Jan 15 Mars a issue unwmk p. 14 (9 stamps)
| - | 175le | multi | Kepler | — | — | |
| - | 175le | multi | Galileo | — | — | |
| - | 175le | multi | Drawings by Huygens in 1672 & Schiaparelli in 1886 | — | — | |
| - | 175le | multi | Sir W Herschel | — | — | |
| - | 175le | multi | Percival Lowell in Arizona 1896-1907 | — | — | |
| - | 175le | multi | Mars | — | — | |
| - | 175le | multi | Mariner 4 1965 | — | — | |
| - | 175le | multi | Mars 2 1971 | — | — | |
| - | 175le | multi | Mars 3 1971 | — | — |
1990, Jan 15 Mars b issue (9 stamps)
| - | 175le | multi | Mariner 9 | — | — | |
| - | 175le | multi | Mariner 9 Phobos | — | — | |
| - | 175le | multi | Cydonia Region | — | — | |
| - | 175le | multi | South polar cap | — | — | |
| - | 175le | multi | Profile of Mars | — | — | |
| - | 175le | multi | Polar cap diff | — | — | |
| - | 175le | multi | Nix Olympica | — | — | |
| - | 175le | multi | Grand Canyon of Mars | — | — | |
| - | 175le | multi | North Pole | — | — |
1990, Jan 15 Mars c issue (9 stamps)
| - | 175le | multi | Olympus Mons | — | — | |
| - | 175le | multi | Viking 1 | — | — | |
| - | 175le | multi | Viking 2 releases Lander | — | — | |
| - | 175le | multi | Lander entering Mars’s atmosphere | — | — | |
| - | 175le | multi | Parachute deployed | — | — | |
| - | 175le | multi | Terminal descent | — | — | |
| - | 175le | multi | Viking lander on Mars | — | — | |
| - | 175le | multi | Soil sampler robotic arm | — | — | |
| - | 175le | multi | Soil Sampler US flag machine | — | — |
1990, Jan 15 Mars d issue (9 stamps)
1990, Feb 5 USAF aircraft (12 stamps)
1990, Apr 23 Disney characters (1990) p. 13.75
| - | 3le | multi | ||||
| - | 6le | multi |
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