I have a few 2nd class stamps with a bar code but with the late Queen's head, not the King's. Can I still use them? - Quora
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When do old stamps expire? The last day to use non-barcode stamps and what happens after the deadline
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Can I use old stamps? How long you can use non-barcode Royal Mail stamps as King Charles designs rolled out
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Royal Mail unveils new everyday stamps with barcodes with current designs to be phased out by January 31, 2023
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Can I use old stamps? How long you can use non-barcode Royal Mail stamps as King Charles designs rolled out
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Month Stamps Set Postage Stamps Journal Planner Diary Scrapbook Decorative Postmark Card Making DIY Moon Phase Stamp - Etsy UK
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Can I swap my old-style stamps despite only new barcode ones being valid from 31 July? | This is Money
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