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<p>[QUOTE=&quot;-jeffB, post: 2733555, member: 27832&quot;]Of course I haven&#039;t. That&#039;s why I&#039;m asking questions. <img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie11" alt=":rolleyes:" unselectable="on" unselectable="on" /></p><p><br /></p><p>I&#039;m interested in this because I&#039;m interested in chemistry and electronics, as well as numismatics and bullion.</p><p><br /></p><p>You seem to have quite a bit of experience buying silver (judging from previous posts). What do you think about the claim that 90% coins from the 1950s and earlier have enough lead and tin impurities to throw off the results? Do you see a consistent difference (with this machine) between newer 90% and older?[/QUOTE]</p><p><br /></p>

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