It was an early example of what we might now call built-in fraud prevention—security embedded directly into the object, rather than enforced externally.
Why the Design Still Exists Today
Even though most modern coins are no longer made of silver or gold, the ridges have never disappeared. In fact, they remain standard in many currencies around the world.
At first glance, this might seem unnecessary. After all, if the metal itself is no longer valuable in the same way, why continue using a design meant to protect it?
The answer lies in function, continuity, and accessibility.
Modern coins still need to be identifiable as authentic. Machine systems used in vending machines, transit systems, and automated counters rely on physical characteristics—including edge patterns—to verify legitimacy. The ridges help distinguish real coins from counterfeit ones with greater accuracy.
But there’s another reason, one that has nothing to do with machines.
For people who are blind or visually impaired, coin edges serve as a tactile system of identification. Different coins often have different edge patterns—some ridged, some smooth, some variably spaced—allowing users to distinguish denominations by touch alone. It’s a quiet but meaningful accessibility feature built into everyday currency.
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