British coins are different from all other coins because they are British coins. The coins of all countries need to be different so that we can tell them apart. What is legal tender in one country, is not legal tender in another country.
apparently Australia has the most coins because our coins keep changing
Hungary
British/English coins and coins of the ancient world have never shown the country name. The country/empire was indicated by the head of the king on the coin. In more recent times, the Royal Mint decided to continue the tradition for British/English coins.
It would depend on what country they are from and what the coins are.
The limits for legal tender vary from country to country and across different coins.
Brazil.
Egypt
China
Guatemala
lucca italy
India, Nepal, and Pakistan use rupee coins.