Initially, the value of the coins was equal to the amount of metal they contained. And scammers often cut that kind of money from the brink, collecting gold and silver. It was incredibly difficult to overcome this, because not everyone carried scales with them, and it was impossible to determine exactly by eye.
Oddly enough, the solution to this problem was proposed by the well-known Sir Isaac Newton, who turns out to be also an employee of the British Royal Mint. He suggested making thin notches on the edges of the coin, due to which the worn-off edges became immediately noticeable. This procedure is carried out to this day, although the need for it has long since disappeared. After all, it is much more profitable and easier to counterfeit banknotes. And the edge of the coin has since been called the edge from the Old English - gyrdan (to girdle).
In the second half of the 16th century, the French invented a device for applying inscriptions on the edge. The first inscription appeared on French golden ecu in 1577.