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Good read - not trying to nic-pic - but my understanding of the following is slightly different.
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"[Note: The die is a negative of a coin, that is, the raised elements on a coin are inset into the die. The metal flow of the planchet flows into the incused areas of the die, and create the raised areas. So, also, the master die, which creates the coin die, is a positive. As a positive, the raised areas are set incused into the die, and so it goes. Nothing great here, just a side note.]"
A die is incused and a negative of the coin design - A Hub is in relief and a positive of the coin design.
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