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https://www.assayofficelondon.co.uk/hallmarking/what-is-a-hallmark#convention
The Date Letter on English Hallmarked Silver
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A Guide to Jewellery & Gold Hallmarks | James Porter & Son
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London Date Letter Chart - Online Encyclopedia of Silver Marks, Hallmarks & Makers' Marks
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11000 English Goldsmiths Marks From 1400 to 1900 RARE - Etsy
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Pocket Edition Jackson's Hallmarks of English, Scottish, Irish Silver & Gold Marks from 1300 to the Present Day : PICKFORD, IAN: Amazon.com.au: Books
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dating english hallmarks silver and gold | Antique jewelry, Antique knowledge, Antiques
Anatomy of a Hallmark - Assay Office
British and Irish commemorative hallmarks - part 2: an article for ASCAS - Association of Small Collectors of Antique Silver website
