Why Dimes and Quarters Have Ridged Edges (Reeded Edges Explained)

Stewart Stimson
Jan 19
3 min read

Updated: Feb 11

Coin History, Anti-Fraud Design, and Why It Still Matters Today

Short answer: those ridges aren’t just decoration.

Long answer: they’re one of the earliest anti-counterfeiting features in monetary history—and they still serve a purpose today.

If you’ve ever rolled a dime or quarter between your fingers, you’ve felt the fine grooves along the edge. In numismatics, this feature is known as a reeded edge, and its origin goes back hundreds of years—long before the United States existed.

What Is a Reeded Edge on a Coin?

A reeded edge refers to the series of closely spaced vertical grooves cut into the edge of a coin. In modern U.S. coinage, you’ll find reeded edges on:

Dimes
Quarters
Half dollars
Dollar coins (with some exceptions)

Lower-value coins like pennies and nickels have smooth edges, and that difference is intentional.

Why Were Reeded Edges Invented? (The Clipping Problem)

Before modern paper money and base-metal coins, coins were struck from precious metals like silver and gold. That made them vulnerable to a practice called coin clipping.

Clipping involved shaving tiny amounts of metal from a coin’s edge—just enough to accumulate valuable scraps without noticeably shrinking the coin. Over time, clipped coins circulated at full face value while losing real metal content.

By the late 1600s, clipping had become so widespread in England that nearly half of the silver content had disappeared from circulating coinage. This mismatch between face value and metal value threatened financial stability across Europe and its colonies.

The solution was simple and effective: add ridges. Once coins were minted with reeded edges, any attempt to shave metal became immediately visible. A smooth or uneven edge was proof of tampering.

Why the United States Adopted Reeded Edges

When the U.S. established its monetary system under the Coinage Act of 1792, it adopted European best practices. From its opening in 1793, the United States Mint designed silver and gold coins with reeded or lettered edges to prevent clipping.

Copper coins didn’t need reeding—the metal wasn’t valuable enough to steal—but precious-metal denominations absolutely did.

Coins Aren’t Silver Anymore—So Why Do Reeded Edges Still Exist?

After the Coinage Act of 1965 removed silver from circulating dimes and quarters, clipping became pointless. Yet reeded edges remained—and for good reasons.

1. Minting Efficiency

Coins are struck inside a steel collar, which forms the edge. Minting presses were already engineered to produce reeding, and there was no functional benefit to redesigning the system. If it works, you don’t fix it.

2. Instant Denomination Recognition

Even without looking, most people can distinguish:

A dime from a penny
A quarter from a nickel

That tactile difference matters in real-world use.

3. Accessibility for the Visually Impaired

Reeded edges act as a sensory aid, allowing visually impaired individuals to identify coins confidently by touch. Long before accessibility laws existed, coinage design already accounted for this.

A Small Detail With Big History

Today’s dimes and quarters may no longer contain silver—but their edges still tell the story of trust, fraud prevention, and smart design. Reeded edges are a surviving security feature, preserved because they still serve people.

That’s one of the quiet beauties of numismatics: nothing is accidental.

The Importance of Understanding Coin Design

Understanding the design of coins, including features like reeded edges, enriches our appreciation for numismatics. It connects us to history and the evolution of currency. Each coin carries a story, and recognizing these details enhances our collecting experience.

The Role of Collectors in Preserving History

As collectors, we play a vital role in preserving the history behind these coins. By valuing the craftsmanship and the stories they tell, we contribute to the ongoing narrative of currency. This connection to the past is what makes collecting coins so rewarding.

Engaging with the Community

Joining a community of fellow collectors can deepen your understanding and enjoyment of numismatics. Sharing insights, discussing findings, and learning from one another fosters a sense of belonging. It’s a journey we can embark on together, celebrating the rich tapestry of coin history.