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<p>[QUOTE=&quot;Sallent, post: 2883437, member: 76194&quot;]Not true. Metallurgical studies have shown that since the time of Gordian III &quot;silver coins&quot; contained more base metal than silver. Gordian III coins are no more than 45% silver, though because of appearance dealers and catalogues still describe them as AR. </p><p><br /></p><p>However, once you get to 20% silver billon during the time of Postumus things get tricky. Some coins look more billon and some more silver due to surface enrichment, so dealers describe them as billon or AR respectively based on looks alone, but they are all still around 20% silver regardless, so I think billon might be a better way to describe them at that point to avoid the inconsistencies in description of the coins.[/QUOTE]</p><p><br /></p>

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