A video on telling real Morgan silver dollars from fake ones from China:
http://www.youtube.com/watch?v=ePxp2dsZ2-Y
There are many other videos. The Chinese make fakes of many of the better known world coins, and the fakes are very, very good.
Weight, luster, sound, design details are markers for fakes.
Thanks I know lots of people have been thinking of investing so I wanted to warn them to make sure they get the real deal.