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Postmarks prevent reusing the exact same stamp
HERE’S THE INTERESTING PART
That messy black ink stamped across your postage is a government security measure designed to ruin your cheap tricks. A postmark exists purely to deface a stamp so you cannot peel it off the envelope and use it again. It just happens to conveniently record the date and location of the post office, turning a simple anti-theft mechanism into a collectible piece of history.
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