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https://www.drloriv.com/antique-tips/silver-jewelry-marks-and-more/
Some jewelry will bear symbols, letters and other hallmarks that come from assay offices. For instance, in the United Kingdom, jewelry marks include information from local or regional assay offices. One of the compulsory marks that must be added to a silver item in Great Britain is the Assay Office mark.
https://goodjewelleryguide.com/jewelry-hallmarks-guide/
Jan 21, 2021 · Jewelry is tested and marked in specific assay offices to see if it meets legal standards. Previously, this marking process was done by stamping, with the …
https://www.invaluable.com/blog/guide-to-jewelry-marks/
Apr 06, 2020 · Jewelry from the United Kingdom contains a series of compulsory and optional jewelry marks set out by the countries’ assay offices. One of the compulsory marks is the Assay Office Mark, a symbol which indicates the regional office that hallmarked the item. Assay Office Mark symbols include an anchor that signifies Birmingham, a castle for Edinburgh, a leopard’s head for London, and a rose …
https://theassayoffice.com/anatomy-of-a-hallmark
The Assay Office marks for gold would be in a Square shield with chamfered corners and in a blunt oval for silver. Import Marks from 1999 Following a ruling of the European Court of Justice the UK is required to accept national hallmarks of member states who provide an equivalent guarantee.
https://www.langantiques.com/university/hallmarks-on-period-jewelry/
These three marks are the most prolific on French jewelry. The crab was used for articles made in the departments while the boar’s head was the mark of the Paris assay office. From 1912 a dog’s head is used as the mark for platinum.
https://www.langantiques.com/university/jewelry-identification/
Jewelry Identification Portuguese Hallmark with Deer and.800 Gold Fineness. This Mark has been Stamped at the Porto Assay Office Since 1985. Solving the intriguing riddle posed by the marks stamped onto a piece of jewelry involves the use of a variety of skills and a wealth of knowledge.
https://www.gold-traders.co.uk/hallmarks/
Have a look at your piece of jewellery. If it was made in a country that adheres to the Convention on the Control and Marking of Articles of Precious Metals (otherwise known as the Common Control Mark), you should find a set of hallmarks / stamps. These markings will be pretty small, so you'll need a magnifying glass to see them properly!
https://www.antiquestradegazette.com/guides/information-guides/hallmarks/
The hallmarks on a piece of antique British silver typically signify (from left to right): the maker, the purity, the assay office, the date it was assayed and the duty mark (for items from 1784 to 1890). Image courtesy of I Franks Antique Silver.
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