The India Government Mint operates four mints in the country for the production of coins. They are in:
- Mumbai, Maharashtra
- Kolkata, West Bengal
- Hyderabad, Telangana
- Noida, Uttar Pradesh
Under The Coinage Act, 1906, the Government of India is charged with the production and supply of coins to the Reserve Bank of India (RBI). The RBI places an annual indent for this purpose and the Government of India draws up the production programme for the India Government Mints on the basis of the indent.
Besides minting coins, the mints at Mumbai, Kolkata and Hyderabad also make coin blanks. Hyderabad, Mumbai and Kolkata mints have gold assaying facilities and the Mumbai mint produces standardised weights and measures.
Bombay (Mumbai) Mint
Bombay (Mumbai) Mint has a diamond under the date of the coin (year of issue). The proof coins from this mint have a mint mark ‘B’ or ‘M’.
Calcutta (Kolkata) Mint
Calcutta mint has no mark under the date of the coin (year of issue). Or it has a “c” mark.
Hyderabad Mint
Hyderabad Mint has a star under the date of the coin (year of the issue). The other mint marks from Hyderabad include a split diamond and a dot in the diamond
Noida Mint
Noida mint has a dot under the year of issue (coin date).