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<p>[QUOTE=&quot;TIF, post: 3203685, member: 56859&quot;]Usual disclaimer:&nbsp; I am not an expert.&nbsp; What I see is surface etching, presumably by burial conditions.&nbsp; I suppose it could be crystallization if that phenomenon occurs in bronze alloys, but it reminds me somewhat of <a href="https://www.google.com/search?q=widmanstatten&amp;source=lnms&amp;tbm=isch&amp;sa=X&amp;ved=0ahUKEwjd2LPP1ufdAhXRpFkKHQ6-CRIQ_AUIDigB&amp;biw=1600&amp;bih=892" target="_blank" class="externalLink ProxyLink" data-proxy-href="https://www.google.com/search?q=widmanstatten&amp;source=lnms&amp;tbm=isch&amp;sa=X&amp;ved=0ahUKEwjd2LPP1ufdAhXRpFkKHQ6-CRIQ_AUIDigB&amp;biw=1600&amp;bih=892" rel="nofollow">Widmanstatten patterns </a>which are seen when you etch certain alloys.</p><p><br /></p><p>You asked earlier if it is something to worry about.&nbsp; Regardless of the cause of this surface appearance, I don&#039;t believe it is something of great concern.&nbsp; Even if it represents embrittlement of the coin, unless you&#039;re planning on dropping it or handling it roughly, I don&#039;t see why it would be a problem unless you just don&#039;t like the appearance.[/QUOTE]</p><p><br /></p>

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