Ridges on the edge of coins
The edge of a pound or a dime is cut with fine grooves. Nobody checks the edge of a coin.
Category: Desk & tools
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Feature. It began as a defence against thieves.
Gold and silver coins were worth their metal, so people shaved slivers off the edges and kept them. Britain introduced the milled edge in the 1660s so a clipped coin was easy to spot.
Source: The milled edge motif, The Royal Mint.