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<p>[QUOTE=&quot;chrisild, post: 1801943, member: 39&quot;]Not sure if we can find a precise date here. One important factor, I think, was the technology developed by Jean-Pierre Droz, a Swiss medal and coin maker who worked in France and Britain. Here is one of his works <a href="http://www.bmagic.org.uk/objects/1969N642" target="_blank" class="externalLink ProxyLink" data-proxy-href="http://www.bmagic.org.uk/objects/1969N642" rel="nofollow">http://www.bmagic.org.uk/objects/1969N642</a> - another one is the &quot;écu de Calonne&quot; (named after the French finance minister). But Droz&#039;s technology was at that time not adopted for general coin production ...</p><p><br /></p><p>Christian[/QUOTE]</p><p><br /></p>

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