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
- Ridges aren’t just for machines.
- They’re for people.
- For those who are blind or low-vision, texture matters.
- A smooth-edged penny or nickel feels different from a ridged dime or quarter
This helps users distinguish coins by touch — a design feature that’s both practical and inclusive
✅ This wasn’t prepared in the 1600s but it’s a beautiful modern benefit.
