Fakes are quite often die struck. In this case a porous surface is usually not found.
For a fake to me made, information has to come from an original coin. That can be done by laser optic scanning and the information stored digitally. A die can be cut from this information using a spark erosion die cutting process. The die is cleaned up by hand under a microscope before being installed in a coining press.
Chinese fakes are often made this way.
Common (but genuine) U.S. gold and silver coins have been used as donor planchets, so that the fake is of the correct metal and weight. In this case the donor coin, which is used as the planchet, is over struck as many times as necessary to completely obliterate the original donor coin information. Obviously, you would only fake very high value coins with this technique to justify the expense.
Even so, a die cut fake can still be picked, because the transferred information onto the fake is not as clear as the original. Experience IS necessary to know what to look for, the eye has to be trained.
For a fake to me made, information has to come from an original coin. That can be done by laser optic scanning and the information stored digitally. A die can be cut from this information using a spark erosion die cutting process. The die is cleaned up by hand under a microscope before being installed in a coining press.
Chinese fakes are often made this way.
Common (but genuine) U.S. gold and silver coins have been used as donor planchets, so that the fake is of the correct metal and weight. In this case the donor coin, which is used as the planchet, is over struck as many times as necessary to completely obliterate the original donor coin information. Obviously, you would only fake very high value coins with this technique to justify the expense.
Even so, a die cut fake can still be picked, because the transferred information onto the fake is not as clear as the original. Experience IS necessary to know what to look for, the eye has to be trained.
Edited by sel_69l
04/22/2012 11:34 pm
04/22/2012 11:34 pm
























