Coins

The invention of coins traces back to the era between 643 and 630 BC in Lydia. They then entered the economy and became a universal representation of money.
In the earlier days, it was used to acquire basic necessities of life by bartering items such as cattle, agricultural produce and skins or furs.
Indian 25 paisa coin
With the rising significance of metal, the idea of exchanging metal coins emerged. Persian, Roman, Greek and Asian coin-collections are well-known for having rich collections of coins.
The Greeks, Persians and finally the Romans minted coins of silver, gold and bronze.
The most famous and widely collected coins of antiquity are Roman coins and Greek coins. India too has spectacular antique coins.
Some centuries ago coins were manufactured in an interesting way. The process involved hitting a hammer positioned over an anvil.
The Chinese introduced other methods of producing coins like cast coinage. Screw and steam processes were also methods used in the early 1700s. The current minting techniques involve utilization of electric and hydraulic presses.