English silver dating marks
In 1300 King Edward I of England enacted a statute requiring that all silver articles must meet the sterling silver standard (92.5% pure silver) and must be assayed in this regard by 'guardians of the craft' who would then mark the item with a leopard's head.In 1327 King Edward III of England granted a charter to the Worshipful Company of Goldsmiths (more commonly known as the Goldsmiths' Company), marking the beginning of the Company's formal existence.
In 1313, his successor, Philippe IV "the Fair" expanded the use of hallmarks to gold works.
To be a true hallmark, it must be the guarantee of an independent body or authority that the contents are as marked.
Thus, a stamp of '925' by itself is not, strictly speaking, a hallmark, but is rather an unattested fineness mark. if metal fineness is claimed, even though there is no official hallmarking scheme in that country.
Signatory countries each have a single representative hallmark which would be struck next to the Convention mark which represents the metal and fineness.
The control or inspection of precious metals was an ancient concept of examination and marking, by means of inspection stamps (punch marks).
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The multi-tiered motif of the CCM is the balance scales, superimposed, for gold, on two intersecting circles; for platinum, a diamond shape and for silver a mark in the shape of the Latin letter "M".