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<p>[QUOTE=&quot;Lehigh96, post: 3279678, member: 15309&quot;]The devices and lettering of the coin provide a measure of protection to the areas that are adjacent to them.&nbsp; The toning on this coin was probably caused by contact with Hydrogen Sulfide gas in the atmosphere, and the areas that are more exposed to the air flow, like the fields and high points of the devices are toned more whereas the recesses of the devices and the lettering are toned less.[/QUOTE]</p><p><br /></p>

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