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They’ve passed through countless hands, slipped into meters, stacked on counters, and flipped to make choices—but have you ever really examined a quarter? Run your thumb along its edge? Those tiny ridges, called “reeds,” aren’t decorative—they’re centuries-old security technology. In the 17th century, coin clipping was rampant.
Thieves shaved small amounts of silver from coin edges, amassing bullion while spending seemingly full-value coins. This threatened entire economies, and something had to be done. Enter Sir Isaac Newton, Warden of the Royal Mint in 1696. His solution: reeded edges. The grooves made it impossible to shave coins without detection—clipped coins revealed uneven or broken ridges.
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Newton even personally prosecuted counterfeiters, restoring trust in currency. Today, dimes, quarters, and half-dollars retain ridges, even though they are no longer made of silver. The reeding continues to serve three purposes: Security—counterfeiters struggle to replicate exact ridge patterns, and banks and vending machines detect fakes using edge sensors. Accessibility—for the visually impaired, tactile differences help distinguish coins.
A smooth penny or nickel feels distinct from a ridged dime or quarter. Tradition & Consistency—ridged coins are familiar; they sound, feel, and roll like money, preserving the tactile experience in a digital world. Pennies and nickels are smooth because they’ve historically lacked precious metals, so clipping wasn’t an issue. Yet quarters and dimes keep ridges as a nod to history, security, and usability. Next time you handle a coin, notice its edge—you’re feeling 300 years of anti-fraud innovation, accessibility design, and tradition, all in your pocket.
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