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<p>[QUOTE=&quot;Jaelus, post: 3142729, member: 46237&quot;]It may have been treated before hand which, depending on how it was done may have made the surfaces more susceptible to rust formation. Having said that, rust isn&#039;t going to just appear without the right conditions, which means improper handling (possibly before you acquired it) and/or improper storage.</p><p><br /></p><p>Did you treat the coin before putting it in the flip and after you handled it for photographing?</p><p><br /></p><p>I have a similar Hungarian set with MS63-65 iron, steel, and zinc (much more problematic than iron) coins from both WWI and WWII. For these coins I treat them with acetone (I treat <i>all</i> coins with acetone before they are stored because I don&#039;t know how they have been handled before entering my care), VerdiCare (for zinc), and then I apply a tiny amount of light mineral oil to protect the surfaces. The only way the WWI era coins really survived without corrosion in high grades was from being kept oiled.[/QUOTE]</p><p><br /></p>

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