CHILLAR KA MAHIMA
In India there are four mint(taksal) who has authority to create coins on behalf of Indian government and those are Mumbai mint, Kolkatta mint, Hyderabad mint, and Noida mint. In all these four mint only Mumbai mint and Kolkatta mint are built in the year 1859 under British Government.
The coins which are produced here will have a diamond shaped icon on the coin. All of the current coins will have a diamond on them before this B or M was used on the coins to indicate Mumbai mint.
The coins produced in this mint will have a star or a diamond shaped icon which indicates it is a Hyderabad mint.
This mint uses a thick dot under the year of manufacturing to show this coin is made in Noida mint.
The coins produced under these mints will not have any kind of mark. It is since the British Government this mint does not use any mark for identification.
Now open your wallet and check which all mints you have in your pocket.