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The front of a penny (Lincoln's profile) or the front of any coin is called the obverse or heads side, the back of a coin is known as the reverse or tails side. There is no jargon for the side or edge of a coin. Some coins have a ridge around the edge. The process for producing that ridge is ''milling''. Also, the corrugated edge of a coin, such as the quarter, is called a ''reeded edge''. The process for creating it is called ''knurling'' or, sometimes, just ''milling''.

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15y ago

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