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Old 01-04-2011, 08:59 PM
Gunner Gunner is offline
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Default Re: Question on Postumus Coin...

I've seen this phenomenon on other lower quality billon coins. I believe what you see is the result of copper precipitating out of the coin over time...I think this phenomenom is one of the main reasons that late roman argentii and siliquae have flan cracks. If you will check my tantalus gallery I have a billon argenteus of Constantine the great that exhibits this precipitation characteristic.
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