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Without complicated tests it is not possible to tell just how much actual silver is contained in any given quantity of the alloy, and a clear field is left for fraud. To safeguard the purchaser a system of testing and marking, known as 'Hall-marking' because it was first carried out at Goldsmith's Hall in London, was instituted as long ago as the year 1300.

From then onwards a number of statutes directed that silverware should be marked with a lion passant to denote it was up to sterling standard, then with a further mark indicating the maker; and another, a letter of the alphabet, standing for the year in which the marking was done.

Additional modifications included a figure of Britannia stamped on pieces with a higher percentage of pure silver than the normal; a mark showing the town where the assay was made: a leopard's head for London, an anchor for Birmingham, a crown for Sheffield, etc

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