Here's Why Some Coins Have Ridges On Their Side - Business Insider

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If you look closely at a quarter or a dime, you'll see tiny grooves all along the edge. They were put there for a very important reason. The process is called "reeding," and it all goes back to when the US Mint was first created.

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If you look closely at a quarter or a dime, you'll see tiny grooves all along the edge. They were put there for a very important reason. The process is called "reeding," and it all goes back to when the US Mint was first created.

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