I want to share some articles I just read about Chinese counterfeit coins.
Be very careful when you buy coins.

http://coins.about.com/od/worldcoins/ig/Chinese-Counterfeiting-Ring/
http://home.comcast.net/~reidgold/draped_busts/chinese.html

How Can I Avoid Silver Eagle Coin Fraud and Other Fake Silver Coins?
http://coins.about.com/od/goldrarecoininvesting/f/fake_coin_fraud.htm