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THE NETHERLANDS SILVER AND GOLD HALLMARKS (1953 TO PRESENT)
Gold Hallmarks: How to Know What Your Jewellery Really Is - Gold Smart
The Compendium of Chester Gold & Silver Marks, 1570 to 1962 : From the Chester Assay Office Registers | Maurice H. Ridgway, Philip T. Priestley
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Anatomy of a Hallmark - Assay Office
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Hallmark Date Letters - A Full UK Guide | BullionByPost
Identifying antique gold hallmarks – an in-depth guide
assay and finess marks for silver gold and platinum before 1975 | Sterling silver flatware pattern, Silver, Silver tea
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https://www.assayofficelondon.co.uk/hallmarking /what-is-a-hallmark#convention
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Hallmarks - Assay Office
