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http://www.nramuseum.org/media/940944/proofmarks.pdf
PROOF MARKS: BRITISH PROOF MARKS - ENGLAND, cont. 2405 PrOOF mark CirCa PrOOF hOuse tYPe OF PrOOF and gun since 1856 Birmingham provisional proof for barrels since 1637 London definitive black powder proof for shotguns,muzzle loader barrels 1811-1892 Liege black powder proof for rifles 1897-1923 Liege black powder proof for riflesFile Size: 765KB
https://www.gold-traders.co.uk/hallmarks/
Gold-Traders has compiled a gold hallmark identification wizard to help decipher the markings that are stamped on your item.. 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.
https://truval.com/blog/jewelry-identification-marks-hallmarks-makers-marks/
Jewelry Makers Marks Silver. Much like gold jewelry maintains a relatively straightforward identification process for karat content, so does silver. Sterling silver, for instance, will have a mark of ‘925.’. This signifies that the piece of jewelry maintains a silver content of no less than 92.5% silver. back to blog.
http://www.silvercollection.it/DICTIONARYDECRYPTINGUKSTERLINGMARKS.html
The British hallmarking system has been substantially modified in 1999. Compulsory marks are the Assay Office mark, the sponsor's or maker's mark (at least two letters within a shield) and the Metal and fineness mark (purity in millesimal number).
https://www.invaluable.com/blog/guide-to-jewelry-marks/
Apr 06, 2020 · The study of jewelry maker’s marks is a fascinating subject, steeped in history, culture, and art. Often overlooked due to their intentionally hidden location and diminutive size, the etchings found inscribed on a piece of modern or vintage jewelry offer a window into the “who, what, and where” of the piece – and are well worth a serious look.
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