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Answer (1 of 4): I don't understand. In the U.S., stamps are the same size, with a few exceptions. Most stamps are approximately 0.9 inches by 1 inch, more or less. A commemorative stamp (one celebrating a famous person, place, or event) is bigger. The stamp for the War of 1812 was about 1.5 inch

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Can I use a large letter stamp on a medium or small envelope? - Quora

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