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Great Britain : PERFINS | The Stamp Forum (TSF)
Perfin Great Britain Used Stamp A25P44F19815 | eBay
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Perfin on Great Britain GB Stamp Used A21P5F4452 | Great Britain, Stamp / HipStamp
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Great Britain : PERFINS | The Stamp Forum (TSF)
GB : Official Perfins Identified Here. - Page 4 - Stamp Community Forum | Calendar stamps, Stamp auctions, Stamp collecting
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Perfin - Wikipedia
Perfin - Wikipedia
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Stamp perfins-what exactly are they? - The Stamp Echo
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