Who authorizes commemorative postage stamps?

I got bought some commemorative postage stamps, but I think they might be fake?

Ummm why didn't you guys tell me that I could not use a food stamp as postage stamp to mail a letter?

Who would you put on the next u.s. commemorative postage stamp and why?

where can i go to get a price on saling old commemorative 22kt. gold replica postage stamps?

Have you ever accidentally licked a self-adhesive postage stamp?

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