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An 180 year-old British stamp is set to sell for £15,000 as it has an exceptionally rare printing error.
The 1841 Line Engraved red one penny stamp is missing the letter 'A' in its bottom right hand corner.
Only 20 were produced before the eagle-eyed printers Perkins Bacon of London spotted the error and corrected it. Most have been damaged since then and there are very few survivors.