How to know the city where the Indian coin was produced ?

Indian coins are mainly produced in 4 cities:

1. Delhi
2. Mumbai
3. Hyderabad
4. Kolkata

The production city puts an identification mark under the year of issue.
...
Coins produced in:

1. Delhi - have a dot

2. Mumbai - have a diamond

3. Hyderabad - have a star

4. Kolkata - Nothing beneath the year

Most of us don’t know this...

Now put your hand inside your pocket/purse and check out!