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The background on this story is interesting. The late Blair Henshaw, noted collector of AIDS stamps, was instrumental in pressuring the Canadian government to release this stamp. As a result, when the postal service was tinkering with "bar colors" for the right side of the stamp, they sent Blair at least one proof sheet of 32 stamps with varied colorations. Unfortunately, the postal service mounted these on corrugated cardboard which will eventually ruin the stamp itself if not restored properly.
The 45 cent stamp is the eventual one that was released. The other two pictured here are proofs.
There was quite a controversy in Tanzania when the Salama stamp was released. Some conservatives became upset, with one bishop urging his parishoners to pray while burning all mail they receive with the Salama stamp on it. It is my understanding that the stamp was eventually recalled.