Coins with jagged edges aren’t just a design choice; they serve as a clever anti-theft measure from the past. This practice, still in use today, was developed to deter thieves when the metal value of coins matched their denomination. Coins like the early American dollars contained substantial silver, leading fraudsters to shave off small amounts. The creation of serrated edges made such tampering evident.
Famous figures like Isaac Newton, as director of the Royal Mint, helped promote this method of fraud prevention, although toothed rims existed in Europe since the 16th century. While ridges effectively protected valuable coins, smaller coins like American cents and nickels have smooth edges because they were made from cheaper metals, making theft unprofitable.
Despite the shift away from precious metals, coin edges remain ribbed due to the legacy equipment and a newfound tactile benefit, helping people distinguish coin denominations by touch. The number of grooves on coins, which varied historically, is now standardized. For example, American dimes have 118 grooves, quarters have 119, and half dollars have 150. In Europe, coins like the euro have different edge patterns to aid identification.
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