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<p>[QUOTE=&quot;Valentinian, post: 3740048, member: 44316&quot;]This has been proven false. Doug&#039;s explanation is correct. You can read about XI and XXI in an academic article here:</p><p><a href="https://www.academia.edu/1263680/The_Alloy_of_the_XI_Coins_of_Tacitus" target="_blank" class="externalLink ProxyLink" data-proxy-href="https://www.academia.edu/1263680/The_Alloy_of_the_XI_Coins_of_Tacitus" rel="nofollow">https://www.academia.edu/1263680/The_Alloy_of_the_XI_Coins_of_Tacitus</a></p><p><br /></p><p>From the NumisWiki: &quot;but with a copper core and a 5% silver coating&quot;.&nbsp; This is stated incorrectly. The core is close to 4% silver and the coating is nearly pure silver, but so thin as to contribute only about another 1% to the total, making the XXI coins (at least they were intended to be) close to 5% silver when new. </p><p><br /></p><p>The fact there are rare &quot;XI&quot; coins with <b>higher</b> silver content than the XXI coins and therefore more valuable shows that 1 of these is <b>not</b> a multiple of a smaller unit (say, a sestertius). </p><p><br /></p><p>Here is a rare &quot;XI&quot; piece:</p><p>[ATTACH=full]1003060[/ATTACH] </p><p>23 mm. 4.01 grams.</p><p>Tacitus (275-276)</p><p>CLEMENTIA TEMP</p><p>Δ</p><p>XI&nbsp; &nbsp;&nbsp; (not XXI)</p><p>RIC 210, Antioch.[/QUOTE]</p><p><br /></p>

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