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French silver made for export carries an assay mark in the shape of the head of Mercury, along with a number to indicate the millesimal fineness: "1" for .920, "2" for .840 and "3" for .750. French silver also is punched with the mark of the maker, by law in the shape of a lozenge, usually with the maker's initials and a symbol.
The assay office marks – from left to right, the leopard's head of London, the anchor of Birmingham, the Yorkshire rose of Sheffield, and the castle of Edinburgh. The assay office marks are no longer an indicator that an item was assayed in the city, or in the UK. Offshore hallmark used by Birmingham Assay Office's subsidiary in India.
Millesimal fineness is a system of denoting the purity of platinum, gold and silver alloys by parts per thousand of pure metal by mass in the alloy. For example, an alloy containing 75% gold is denoted as "750".
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The BIS Hallmark is a hallmarking system for gold as well as silver jewellery sold in India, certifying the purity of the metal. [1] [2] It certifies that the piece of jewellery conforms to a set of standards laid by the Bureau of Indian Standards, the national standards organization of India.
However, in silversmithing, coins could come from other nations besides the United States, and thus coin silver objects could vary from 750 millesimal fineness (75% silver) to 900 (90% silver). Coins were used as a source of silver in the US until 1868, shortly after the discovery of the Comstock silver lodes in Nevada, which provided a ...
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Other hallmarks include a hammer, and three "X" marks. William B. Kerr & Co. newark, New Jersey Ca. 1880s - 1927 Well regarded for Art Nouveau jewelry, holloware and vanity items. Absorbed into Gorham in 1927.