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<p>[QUOTE=&quot;Spark1951, post: 26208458, member: 90692&quot;]More info:&nbsp; the obverse has a rim, which means the coin was “upset” properly (in the Upsetting Mill) which creates the rims on both sides.</p><p><br /></p><p>Yet, the reverse design and rim are gone, probably from sliding on fine grit sandpaper or using a dremel-type grinder.&nbsp; The copper plating on the CPZ is only about 7 microns thick.</p><p><br /></p><p>The before-grinding weight would need to be known to find out how much the weight of the coin was diminished, both plating and some of the zinc core having been removed.[/QUOTE]</p><p><br /></p>

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