The city mark no longer indicates the city in which the piece was assayed, or that the item was assayed in the UK.The typeface, whether the letter is uppercase or lowercase, and even the shape inside which the letter is stamped, must all be taken together to determine the year. The date mark is a letter indicating the exact year in which the piece was made.The purity mark for Irish silver is the harp crowned. It became an optional standard thereafter, and in the United Kingdom and Ireland is now denoted by the millesimal fineness hallmark "958", with the symbol of Britannia being applied optionally. The Britannia standard was obligatory in Britain between 16 to try to help prevent British sterling silver coins from being melted to make silver plate. The mark for silver meeting the sterling standard of purity is the Lion Passant, but there have been other variations over the years, most notably the mark indicating Britannia purity.
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