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<p>[QUOTE=&quot;calcol, post: 26238604, member: 77639&quot;]Almost all the coins from the SS Central America were covered with an adherent layer of rust of a form called goethite.&nbsp; They were really ugly … like rusted washers!&nbsp; Robert Evans, an Ohio geologist and paleontologist, was hired to restore the coins.&nbsp; After considerable research and experimentation, he found a way to remove the goethite without altering the gold surfaces underneath.&nbsp; Many were graded MS by PCGS.</p><p><br /></p><p>You can read about here:</p><p>&nbsp;<a href="https://www.coinworld.com/voices/eighteen_years_ago.html" target="_blank" class="externalLink ProxyLink" data-proxy-href="https://www.coinworld.com/voices/eighteen_years_ago.html" rel="nofollow">https://www.coinworld.com/voices/eighteen_years_ago.html</a> or watch a video on it here: [MEDIA=youtube]9-Gvr8s2YNU[/MEDIA] .</p><p><br /></p><p>The mess on the coin in the OP can almost certainly be removed with little change to the underlying gold … but only by an expert.&nbsp;&nbsp; PCGS or NGC can probably do it.&nbsp; Would I buy the coin?&nbsp; Only at a bargain price.</p><p><br /></p><p>Cal[/QUOTE]</p><p><br /></p>

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