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<p>[QUOTE=&quot;GDJMSP, post: 7988829, member: 112&quot;]The spec weight for a &#039;79 dime is 2.268 gm, and it has a tolerance range of +/- 0.091 gm meaning coins between 2.359 gm and 2.177 gm are within mint tolerance levels. </p><p><br /></p><p>That means your coin is 0.061 gm too heavy.</p><p><br /></p><p><br /></p><p>These specs are confirmed here - </p><p><br /></p><p>[ATTACH=full]1386242[/ATTACH] </p><p><br /></p><p><br /></p><p>As for your question, there are two possible reasons for the coin to weigh heavy. </p><p><br /></p><p>1 - you said you verified your scale by weighing other coins. Well that might work and it might not because with the over-weight of your coin being so small, 0.061 gm - a difference like that might be explained by the tolerance levels of the other coins you weighed. And since we don&#039;t know what those specific weights of the other coins were, that can&#039;t be judged. What you need to do is to calibrate your scale by using a calibration weight, only then can you know with certainty that your scale is measuring accurately. Until you do that, you can&#039;t know with certainty that your coin is too heavy.</p><p><br /></p><p>2 - it&#039;s possible your dime was minted on a planchet error, a thick planchet in other words, a heavy planchet. They are uncommon but they do occur now and then.[/QUOTE]</p><p><br /></p>

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