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Comoros
Scott number unknown
The virus on the top-left of this sheet is an HIV virus.
Chad
Information regarding these stamps can be found on the illegal stamp page.
El Salvador
Scott 1678
Ghana
Scott 265a-b
Ghana released this souvenir sheet in honor of President Bush's trip to Africa to promote American foreign policy on AIDS.
Guinea-Bissau
Scott number unknown
This stamp is part of a six stamp sheet titled, "Defenders of Peace" featuring the likes of Pope John Paul II, Gahndi, Mother Teresa, Princess Diana, Jimmy Carter, and Martin Luther King, Jr. It's a rather shameless ploy to attract international collectors for a stamp sheet undoubtedly not sold at home. Is it valid though? Michel and Yvert seen to think so, with numbers 3954 and 2677 respectively. That doesn't mean it's not a case of excess stampage though, something for which Guinea Bissau is infamous.
Macedonia
Scott RA146
For a while we thought there was a second stamp released this year, but it turned out to be a cinderella stamp so we moved it to our cinderella issues page.
Mali
Scott number unknown
An article on a Mali website stated that there are additional stamps in this series. I have not been able to find any evidence of them.
Mongolia
Scott 2659
Papua New Guinea
Scott 1339 - 49
I am not sure what the Scott number are for the two souvenir sheets yet.
Sao Tome and Principe (St. Thomas)
Scott number unknown
I have the sneaking suspicion these stamps may not be legal, but at present I have no evidence to support my hunch.