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<p>[QUOTE=&quot;kanga, post: 646031, member: 9270&quot;]Many (not all) coins toned on both sides are AT.</p><p>Particularly it the toning on both sides is similar.</p><p>&nbsp;</p><p>Coins in old force-fit albums (only one side showing) had a different environment on each side. Different toning.</p><p>End coins from rolls had a different environment on each side. Different toning.</p><p><b>BUT</b></p><p>Coins in more modern albums (plastic slides) pretty much have the same environment on each side. Similar toning. But more protection so less likely to have eye-grabbing toning.</p><p>Coins in 2x2&#039;s, flips, Capital Plastic, etc. pretty much have the same environment on each side. Similar toning. But more protection so less likely to have eye-grabbing toning.</p><p>Coins in the old paper envelopes pretty much have the same environment on each side. Similar toning. But the paper was not archival (contained sulfur) and those coins REALLY toned, but generally a uniform black.</p><p>&nbsp;</p><p>I sure others here can come up with othe storage types.</p><p>&nbsp;</p><p>Bottom Line: It takes rather special conditions for a coin to naturally tone like yours.</p><p>Unlikely that it&#039;s NT.[/QUOTE]</p><p><br /></p>

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