We have been exposing the forgeries listed by auctioneers under the Proxibid.com platform.
One of those auctioneers is Aaron Joseph & Company, Tallahassee FL who is selling some Mantle, Williams, DiMaggio, etc. forgeries with a COA from "CSC Collectibles."
Here is their YouTube video for the aforementioned items:
http://www.youtube.com/watch?v=44IwThaoxdU