How to identify if an ancient coin is fake?

1 paisa coin with a hole, India 1947

Fake coins can be of two types. There are fake coins which we minted contemporarily at the same time as the originals. They have their own historical significance. The other types of fake coins are those which are minted in present time and that is the kind of fakes that we will focus on. The interesting part is even these fake coins will be historically significant a couple of centuries later.