The Hidden History Behind Coin Ridges: Why Dimes and Quarters Have Those Tiny Grooves

 

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The Hidden History Behind Coin Ridges: Why Dimes and Quarters Have Those Tiny Grooves
By Han tt – 23/09/2025

They’ve been held a thousand times by you.
They were slipped into parking meters.
On counters, they were stacked.
flipped them to make choices.

But have you ever really looked at a quarter?
Run your thumb along its edge?

Those tiny ridges — they’re not just for grip.
They’re not decoration.
They’re not an accident.

These anti-theft measures date back 300 years, to a time when silver hoards, powdered wigs, and cunning crooks believed they could outsmart the king.

Let’s explore the wild, true story behind coin ridges — and why they still matter today.

The Crime That Created Coin Ridges: “Coin Clippin

Enter the coin clipper — a clever (and illegal) thief who would:

Shave tiny slivers of metal from the edges of coins
Gather the shavings to melt down into bullion
Spend the clipped coin as full value — because it still seemed whole
Just a little off each coin.
Hard to notice.
But do it hundreds of times?
You’d have a fortune in stolen silver and the government would be none the wiser.

This wasn’t rare.

It was uncontrolled.

And it menaced the entire economy.

The Solution: Reeded Edges — The Original Anti-Fraud Tech
Let’s introduce Sir Isaac Newton. That Isaac Newton, indeed.

The renowned physicist was appointed Warden of the Royal Mint in England in 1696.

And one of his initial expeditions?

Put down the coin clippers.

His remedy?

Coin edges can be given ridges, or “reeds.”

It was impossible to clip silver without being noticed because of these reeding grooves.

Why?

A clipped coin would have broken or uneven ridges
A full coin had perfect, continuous grooves
No machine at the time could reproduce the mint’s precise reeding pattern
It was 17th-century security tech — and it worked.
 Fun fact: Newton personally prosecuted over 100 counterfeiters — some of whom were sentenced to passing.

Why Some Coins Still Have Ridges (And Others Don’t)
Fast forward to today.
Coins aren’t made of silver anymore (except for special editions).
So why do quarters, dimes, and half-dollars still have ridges?

Because the tradition stuck — and it still serves three crucial purposes:

1. Security Against Counterfeiting

Even today, reeding is part of a coin’s security profile.

Modern counterfeiters struggle to reproduce the exact number and depth of ridges

Vending machines and banks use sensors to “read” the edge — helping detect fakes

2. Accessibility for the Visually Impaired

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