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<p>[QUOTE=&quot;ArtDeco, post: 7684783, member: 119259&quot;]I don&#039;t really send my coins to NGC anymore, the way I like to display them, I just use DIY slabs that have the self foam inserts (pvc-free of course).</p><p>I just don&#039;t see any reason to send to NGC unless I want to resell coins that way or if I get a really expensive Gold coin, but I&#039;m less likely to.</p><p><br /></p><p>If that really is some dirt deposit on the reverse of your Septimius and you plan to remove it, break open your slab and let the coin rest in distilled water for 1-3 days and then use a very light non abrasive tool to &quot;lighty brush&quot; the looser dirty away.</p><p><br /></p><p>It does look to be just patina though and if it is, I would definitely just leave everything alone. Your NGC slabs aren&#039;t airtight long term anyways so the coins would eventually get some nice toning to blend with that patina mark.[/QUOTE]</p><p><br /></p>

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