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<p>[QUOTE=&quot;desertgem, post: 2649998, member: 15199&quot;]I am fairly sure it is PMD, no matter what. The decrease in all 3 dimensions is a sign of acid effect, which also would remove the copper and then react badly with the zinc core. Perhaps also the edges were exposed to a grinding action, as even normal extensive wear does not diminish the rim so much more than the middle area. the weight is OK for all of that.[/QUOTE]</p><p><br /></p>

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