Coin edge

Coin edges may be plain (smooth) or patterned, or a combination of both. They can also include lettering.

Coin edge inscription mill

Reeded edges are often referred to as "ridged" or "grooved" (US usage), or "milled" (UK usage).[1] Some coins, such as United States quarters and dimes, have reeded edges. Reeding of edges was introduced to prevent coin clipping and counterfeiting.[2][3]

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 rings, which pattern the edge at the time when the coin is being milled.

Coin edge patterns

Examples of patterns used on coin edges include:

See also

References
Wikimedia Commons has media related to Edges of coins.
  1. Concise Oxford Dictionary (2006): mill, produce regular ribbed markings on the edge of (a coin)
  2. About.com: "Reeded Edge Defined - What is a Reeded Edge?"
  3. Why do some coins have ridges around the edges?
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