http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=300370321270

The above item is being sold on eBay. It was authenticated by JSA, and I'm wondering what I'm missing. I know that the Mantle/Mays/Snider plate that I posted was deemed printed on, but it's from the same "Autographed Edition" series as this Williams plate.

How did the company get away with having some real and some fake?