Planchet Preparation Errors
To prepare planchets on which to strike coins, a mint first purchases strips of metal of the correct composition of the coin to be produced. These strips are fed through a blanking machine that cuts them into the metal disks on which the coins are struck, which are known as blanks or planchets. The shape of the coin, whether it be circular, rectangular, or any other shape, is determined by the manner in which the blanking machine shapes the planchets. At this stage, the blanks are type 1 blanks. Next, these type 1 blanks go into an upending mill, which gives the blanks an upended rim, which is where the rim becomes slightly raised and rounds off to the center of the planchet. Planchets with upended rims are called type 2 planchets.
Read more about this topic: Mint-made Errors
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