Jeepers-creepers, that's awesome. My oldest coin is from 1658, and it ain't silver (Spanish 4-maravedi from a mission that was burned by pirates in the 1680s).
What part of SC are you from? I'm just south of you, in the Golden Isles of GA. I was just talking to somebody about how I'd like to poke around the SC Lowcountry a bit, maybe in the Beaufort area.