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<p>[QUOTE=&quot;cladking, post: 50588, member: 68&quot;]If it&#039;s a real error there will be a weakness directly opposite the straight line.&nbsp; This is called the Blakesly effect and occors because of the way the planchets are prepared.&nbsp; The flat discs are cut out of a sheet of metal and have to be squeezed between rollers to make the metal thicker where the rim will be and reduce the diameter for coining. This process is called &quot;upsetting&quot;.&nbsp; If a planchet is defective when it goes through upsetting then there won&#039;t be any pressure on the wheels when it goes through and the metal won&#039;t pile up directly opposite the missing piece of the coin.&nbsp; This will result in weakness in this area.&nbsp; If this isn&#039;t present the coin is alterred.[/QUOTE]</p><p><br /></p>

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