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美国的纪念邮票在邮局公开发售,销售时间大约一年。邮票发行量事先公布,通常每套在4000万到9000万枚之间。 2003年9月发行的美国首都华盛顿特区菱形纪念邮票
The U.S. commemorative stamps are on sale at the post office for about a year. Postage stamps are announced in advance, usually between 40 and 90 million. September 2003 issue of the Washington DC diamond memorial stamp