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https://www.assayofficelondon.co.uk/hallmarking/what-is-a-hallmark #convention
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London Date Letter Chart - Online Encyclopedia of Silver Marks, Hallmarks & Makers' Marks | Maker's mark, Antique knowledge, Hallmark
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A Guide to Jewellery & Gold Hallmarks | James Porter & Son
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Simple Gold Hallmark Guide
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Identifying antique gold hallmarks – an in-depth guide
https://www.assayofficelondon.co.uk/hallmarking/what-is-a-hallmark #convention
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Gold hallmarks - a brief guide | GOLD.co.uk
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Hallmarks hi-res stock photography and images - Alamy
