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<p>[QUOTE=&quot;hontonai, post: 1003385, member: 4703&quot;]Japanese error coins are extremely rare, as both the Tokyo and Osaka mints have highly efficient quality control.</p><p><br /></p><p>To manufacture a coin from a strip of coin metal, a series of round blanks are punched out.&nbsp; The blanks (by the thousands) then go through a step called &quot;upsetting&quot; where the raised rims <i>on both sides</i> are created, turning the &quot;blank&quot; into a &quot;planchet&quot;.&nbsp; The planchet then goes through the dies and becomes a coin.</p><p><br /></p><p>If your Showa 46 (1971) coin were really a planchet that had been struck on only one side, the other side&#039;s rim would be raised.&nbsp; In all probability yours was shaved by someone - perhaps as a prelude to creating a two-tailed coin.</p><p><br /></p><p>Have you checked the weight?&nbsp; My bet is that it is significantly less than a genuine 10 yen&#039;s 4.5g.[/QUOTE]</p><p><br /></p>

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