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Postage stamp - Wikipedia
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Why do some stamps have barcodes and numbers like this? : r/USPS
Royal Mail stamp exchange: When do old stamps expire? | Express.co.uk
When do stamps expire? Plus, how to swap out old stamps | GoodtoKnow
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My stash of old stamps is beautiful. Why make them unnecessarily obsolete? | Dale Berning Sawa | The Guardian
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Do Postage Stamps Expire in 2023? - Postagestampsdeals
Royal Mail confirms exact date traditional stamps will become invalid in the UK - Edinburgh Live
When do stamps expire, as price of first-class stamps increases? | Evening Standard
