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https://www.langantiques.com/university/hallmarks-on-period-jewelry/
Although the French law requires all gold jewelry to have a minimum purity of 18 karat, items that are intended for export may be marked with the pictorial marks for 9k and 14k. French Export Mark from 1840 to 1879. Image Courtesy of the Hallmark Research Institute.
https://www.bullionbypost.co.uk/index/gold-and-silver/hallmark-date-letters/
Hallmark date letters. Precious metals, such as gold and silver, are generally too soft and malleable for practical use. They are therefore mixed or alloyed with other harder metals. Hallmarks provide proof of an article's precious metal content. British hallmarks date back to medieval times. In 1757, counterfeiting hallmarks was made a felony and punishable by death.
https://www.raregoldjewelry.com/guide-stamps-inscriptions-gold-jewelry
Feb 20, 2013 · Authentic gold jewelry should have a stamp to indicate the purity of the gold in the piece. This mark can be in several different formats. For example: 585, 14kt and 14K all mean 14 karat gold. All of these formats are easy to understand, except possibly the 3 digit number format.
https://theassayoffice.com/date-letters
The same letters were used for Gold, which has been marked in Birmingham since 1824, but with a background of a square with cut corners. There may be some variations in backgrounds during the late 19th century, especially on watch cases. In Birmingham the date letter changes in July up to 1974.
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