Web Reference: Aug 7, 2025 · Ridges help visually impaired individuals distinguish between coins of similar size. For instance, a dime is smaller than a penny, but the ridges give it away immediately by touch. Jan 19, 2026 · Why do coins have ridges on their edges? Learn about the fascinating history of reeded edges, from preventing coin clipping to Isaac Newton's role at the Royal Mint. Feb 23, 2022 · But why do some coins have ridges while others don't? It turns out the answer dates back to the Coinage Act of 1792, which created the U.S. Mint, according to Insider.
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