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<p>[QUOTE=&quot;physics-fan3.14, post: 2990837, member: 19165&quot;]That&#039;s actually a really good question. There is no time limit involved, because unless you&#039;ve been tracking the coin since it was minted, you have no idea. </p><p><br /></p><p>When I use the term &quot;old cleaning&quot;, what I mean is &quot;the coin has been cleaned at some point in the past but has regained some patina or toning to the point where its not fresh, bare metal exposed. The coin looks mostly ok, but someone who knows what they are talking about can still tell.&quot;[/QUOTE]</p><p><br /></p>

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