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<p>[QUOTE=&quot;physics-fan3.14, post: 2045841, member: 19165&quot;]Well, I&#039;ll make two points here. Obviously, I haven&#039;t seen either coin in hand, so this is purely speculation.</p><p><br /></p><p>The first - Rust only applies to Iron Oxide. Very few coins were ever made from Iron (I know of a few from Sweden), so very few coins will ever exhibit rust.</p><p><br /></p><p>Second - The UNC Details 10 Won coin has had moderate damage of the surfaces due to the corrosion. This coin would be unacceptable as a problem free coin. The coin in your OP does not appear to have surface damage. There are spots, and they are ugly - that is why the grade is low. But the surfaces have not been eaten away, like on the other coin. As a point of technicality - all toning is corrosion. When the toning has evolved to the point of damaging the surface, it is called environmental damage. Your coin does not appear to have reached that state (an in hand evaluation may reveal a different opinion).[/QUOTE]</p><p><br /></p>

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