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<p>[QUOTE=&quot;Any Jewelry, post: 2453508, member: 2844&quot;]Here is some info on the convention, it says it was signed in 1972, but came into force in 1975. </p><p>So the mark is no earlier than 1975, and as I said before, some countries joined later. Countries are still joining, and others are aspiring members, working on establishing a quality control system.</p><p><br /></p><p><a href="https://www.assayofficelondon.co.uk/hallmarking/convention-other-legal-marks" target="_blank" class="externalLink ProxyLink" data-proxy-href="https://www.assayofficelondon.co.uk/hallmarking/convention-other-legal-marks" rel="nofollow">https://www.assayofficelondon.co.uk/hallmarking/convention-other-legal-marks</a>[/QUOTE]</p><p><br /></p>

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