QUOTE(tommyd @ Jun 6 2007, 07:25 AM) [snapback]328453[/snapback]
"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...
Thanks tommyd, I was more curious about the black specks in the center. Its a type of toning I never really come across. Perhaps why I got it for a decent deal.