I understand the "know the coin or the seller - preferably both" mantra - so I thought I should get that excellent advice out of the way first. I also check the "Fake Seller List" on Forvm (when eBay shopping), checking return policies of sellers, and feedback (although not to be relied upon really).. and I also know that you can never be sure of the authenticity of a coin from a photograph. I would like to understand what a "cast fake" means.. I assume a mold is made of an authentic coin and copies are made from that mold.. in most (?) cases leaving a seam (which may be filed down to make this harder to identify?) and in many cases "flow lines" of the metal on the coin (especially from the legends) are a pretty good sign of authenticity.. although would that not work from a mold? Also legends or the general look of the coin may be "mushy" or not as sharp from a mold - which makes some sense to me. Regular visitors here also understand that there are nearly daily requests posted asking for authenticity confirmations.. This I know... but there is so much that I do not. Tonight I have seen a term I have not noticed before - "sand cast mold". I am hoping that the experienced members here can: -display some fake coin examples -explain how they are made -explain what to look for in general terms New technologies may be able to help us identify these fakes (I hope)- but also may work the other way and make them more difficult to identify I assume. This issue may be a huge threat to our hobby and I hope that the experienced collectors here can help me get up to speed on this issue.