I have a coin that has been identified as Northern Sung Dynasty - Yuan-Feng Tong Bao, Yuan Feng (1078 - 1085) the coin is somewhat crusty but the characters are legible. Sorry I can't provide a photo, my camera won't focus down enough for a clear picture. Any idea if it's worth anythinh?
If this is the same coins you posted about a few days ago, I checked your link, and I don't think they were athentic. You said you paid about a buck a piece for them, and they are worth that as conversation pieces alone. They are neat to have, but I don't think it carries any significant collector value.