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<p>[QUOTE=&quot;cladking, post: 8149311, member: 68&quot;]Probably a grinding wheel.</p><p><br /></p><p>A great number of these are misidentified as being &quot;dryer coins&quot;.&nbsp; It&#039;s usually impossible to be certain unless there are blade marks surviving under the missing metal or the diameter is reduced.&nbsp; These are caused by the metal being shaved off with a knife or perhaps a file.</p><p><br /></p><p>There are lots of ways that coins get damaged but other than in rotating machinery or through intent there is a strong tendency for damage to be irregular.&nbsp; Coins can get the circular scratches by someone turning while standing on one but typically these are caused by coin rolling machines.&nbsp; You can&#039;t really tell the difference.</p><p><br /></p><p>Quarters have a 30 year life expectancy so this one&#039;s time is up.&nbsp; It&#039;s a wonder how many old coins are still around.[/QUOTE]</p><p><br /></p>

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