Milling, also called reeding, was first added to the edges of gold and silver coins during the Middle Ages to combat a form of theft called "shaving".
When coins had smooth edges crooks would scrape tiny bits of metal from around the rim. Done carefully, shaving didn't make the diameter obviously smaller so the criminals simply re-spent the coins at their original value. The scrapings were then sold for an added, uh, profit.
Adding reeds to coins' edges made shaving much more obvious. Anyone who tried to spend a shaved coin would immediately arouse suspicion, which greatly reduced its incidence.
Shaving is no longer a threat because modern circulation coins are don't contain gold or silver, but many mints still add reeding to their coins' edges. In the US and Canada reeding is retained mostly a matter of tradition, but other countries use it to help make coins more easily recognizable to people with visual impairments. For example, many euro coins are similar in size but different denominations are distinguished by having narrow (closely-spaced) reeds, wide reeds, or even "interrupted" reeds; i.e. alternating segments of reeded and smooth surfaces.
It prevented thieves from shaving off precious metal from around the edges of coins.
Nothing is added to make a coin milled. Milled means it been struck by a machine.
When a coin is milled it means that the coin was made using machines instead of hand made. Milled coins have ridges outlining the coin. The dime and the quarter are milled.
they used dye and milled it
Yes - the ridges are called milling, or reeding.
Perhaps in a bank or a mint.
Coins were very crudely struck or 'hammered'. The milled coins did not appear until 1660.
The milled edge on 10p coins serves both functional and aesthetic purposes. Functionally, it helps prevent counterfeiting by making it more difficult to replicate the coin accurately. The milled edge also provides a tactile feature that can help distinguish the coin from others. Additionally, it adds to the coin's durability by reducing wear from handling.
The Spanish Milled Dollar isn't particularly rare, which affects its value. These coins range in value from $35 to $100.
Milled edges on coins, also known as reeded or grooved edges, serve several purposes. Primarily, they help prevent counterfeiting and tampering by making it difficult to shave off metal without detection. Additionally, milled edges can enhance the coin's grip and handling, and they often provide a visual distinction that adds to the coin's aesthetic appeal.
The only George III coins with Britannia on the reverse are the Twopence, Penny, Halfpenny and the Farthing, but none of them had a milled edge. From 1797, the Penny was 36mm in diameter, the Twopence was 41mm in diameter and both coins were made from copper.
From 1969, the Australian 50 cent coin, when it was reintroduced, had 12 sides so that there was a good visual distinction between the 50 cent, and the 3mm smaller 20 cent coins, and you could also feel the difference between the two coins.