... for anyone in the market, this is what I have seen, and seeing this auction reminded me to tell you all.
The fake silver dollars, like this one and other dollar-sized coins have one major flaw: the portrait, and especially in the center of the coin, is very weak. And, of course, the lettering is always off.
Here's a fake:
http://cgi.ebay.com/CHINA-OLD-COIN-...4QQhashZitem270356699522QQitemZ
270356699522QQptZLHQ5fDefaultDomainQ5f0QQsalenotsupported
And here's what you can compare it to. Notice the lettering on the real one and portrait detail, especially on the mustache.
http://home.netvigator.com/~ykleungn/yuansk2.htmHere's another one:
http://cgi.ebay.com/CHINA-OLD-COIN-...4QQhashZitem270356701220QQitemZ
270356701220QQptZLHQ5fDefaultDomainQ5f0QQsalenotsupported
Compare it to the real ones from the above site and you can see that the real chop mark is supposed to be incuse.
One more thing... I don't think there were 5 dollar silver coins...
And another thing... if there's only a few hours left and there's only a low bid, chances are it's a fake.