I see no postage cancellation marks on stamps affixed to a letter I received today, can these stamps be theoretically reused? - Quora
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Stamps] UK stamps, prices, Royal Mail & Post Office matters - British Isles - Postcrossing Community
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Can you still use old stamps? Why the Royal Mail now uses barcodes and how to return out of date stamps
![File:The Soviet Union 1980 CPA 5098 stamp (Soviet-Vietnamese Space Flight. Cosmonauts returning to Earth).jpg - Wikimedia Commons File:The Soviet Union 1980 CPA 5098 stamp (Soviet-Vietnamese Space Flight. Cosmonauts returning to Earth).jpg - Wikimedia Commons](https://upload.wikimedia.org/wikipedia/commons/1/11/The_Soviet_Union_1980_CPA_5098_stamp_%28Soviet-Vietnamese_Space_Flight._Cosmonauts_returning_to_Earth%29.jpg)