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tommyd

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  1. "1941 Walking Liberty Half Dollar - Proof-66. what is that dark toning caused by?"

     

     

    Oxidation due to exposure at some point to potentially a number of contaminants, including heat, dampness, pollution, etc. The patina of a silver coin is vulnerable to anything that hits it -- BU silver coins should always be stored in dark, dry and cool environments, and away from airborne pollutants -- easier said than done...

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