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London assay office hallmarks on the back of a waiter, or small square salver. Marks indicate it is Britannia gauge silver made by (or for) Paul de Lamerie (taken to or) in London and dated 1732 (it could have been made a year or two earlier than 1732). A stamp indicating the purity of the silver is called the assayer's mark.
Britannia silver is an alloy of silver containing 11 ozt 10 dwt (i.e. 11½ troy oz.) silver in the pound troy, equivalent to 23 ⁄ 24, or 95.833% by weight silver, the rest usually being copper.
Online Encyclopedia of Silver Marks, Hallmarks & Maker's Marks; Gold hallmark identification wizard; List of basic hallmarks from various countries (archived 26 October 2015) More complete list of UK hallmarks past and present; Hallmark Convention; Silver Hallmark Encyclopedia (Archived 2016-03-02 at the Wayback Machine
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The four wardens of the Goldsmiths’ Company were tasked with visiting workshops in the City of London to assay (test) silver articles. If these articles were found to be below standard they were originally forfeit to the king, but if they passed, each article received the king's mark of authentication which was the mark of a leopard's head.
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