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The Global Insight

What does it mean for a coin to be milled?

Author

Michael Gray

Updated on April 08, 2026

In numismatics, the term milled coinage (also known as machine-struck coinage) is used to describe coins which are produced by some form of machine, rather than by manually hammering coin blanks between two dies (hammered coinage) or casting coins from dies.

Why do people shave down coins?

Say you had a one pound coin, that coin was literally a pound of silver. If you shave it it is no longer a pound of silver so when you get a pound worth of goods, you have committed theft. That is why coins have milled edges, because they can readily be seen to have been tampered with.

Why are there rough edges on coins?

Reeding of edges was introduced to prevent coin clipping and counterfeiting. The main techniques of coin edging are edge mills of various types, which put a pattern on a smooth edge after a coin and coin mills with edge ring, which pattern the edge at the time when the coin is being milled.

When did milled coins start?

Milled coins were minted for the first time in 1561, in the reign of Elizabeth I. A screw press powered by horses was used in their manufacture, under the supervision of a Frenchman, Eloye Mestrelle. The quality of the coins was vastly superior to the normal hammered coinage, but production was much slower.

What machine is used to make coins?

The model is then placed into a machine called a pantograph, which shrinks the model to the proper size and traces its design onto the single steel coin die. This entire process will be repeated for the design on the other side of the coin.

Why do pennies not have ridges?

The reason why today’s pennies and nickels have no ridges is due to the lower value. It actually costs more to produce the penny than the coin is worth itself, meaning that the copper within the coin is more valuable than the actual coin.

Why don t pennies and nickels have ridges?

What coins have bumpy edges?

Quarters and dimes have a “reeded” edge, while nickels and cents have a “plain” edge. You may have noticed that the quarters and dimes in your pocket or purse have a “reeded” edge, featuring vertical grooves or ridges, while nickels and cents in your pocket have a “plain” or smooth edge.

When did they start making coins at the mill?

A mill for inscribing or milling the edges of coin flans or planchets. Meanwhile, in continental Europe, France readopted machine made coins in 1639. Both machine made and hammered coins continued through the recoinage of French silver in 1641, but this time machine made coinage’s time had come and hammered French coinage ended in 1645.

What does the term milled coinage mean in numismatics?

e In numismatics, the term milled coinage (also known as machine-struck coinage) is used to describe coins which are produced by some form of machine, rather than by manually hammering coin blanks between two dies (hammered coinage) or casting coins from dies.

Why are milled coins bad for the environment?

This was problematic because an increase in the supply of bullion from central Europe and America was overworking mints. That led to low quality coins which were easily forged or clipped, i.e. precious metal was shaved from the edges of the coins.

What does the inscription on the edge of a milled coin mean?

The inscription chosen for the edge— DECVS ET TVTAMEN, meaning an ornament and a safeguard—refers to the protection against clipping which the lettered edge provided. In accordance with Gresham’s law, however, the inferior hammered coins limited the circulation of his coins until the hammered coins were demonetized in 1695.