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<p>[QUOTE=&quot;red_spork, post: 2840192, member: 74282&quot;]Appears to be some sort of green encrustation. Sometimes green or blue spots on a bronze/brass coin can be a form of active corrosion known as &quot;bronze disease&quot; but in this case, it appears to be on top of the coin, so is likely some sort of green mineral encrustation, possibly malachite or similar. At any rate, it doesn&#039;t appear to be eating into the coin, so it&#039;s nothing to worry about if it doesn&#039;t bother you. The only concern I have with it is that it covers up the Chi-Rho which some collectors prefer to be nice and bold on their coins due to the association with Christianity. If it being covered up is not a deal breaker for you, go for it![/QUOTE]</p><p><br /></p>

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