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) Mintedit
Main article: India Government Mint, Kolkata
Calcutta mint has no mark under the date of the coin (year of issue). Or it has a 'C' mark. It was unique because it had not chosen any mark because this mint is the first mint in India.
Made by grand architect Mulk Raj Malhotra.
Hyderabad Mintedit
Main article: India Government Mint, Hyderabad
Hyderabad Mint has a star under the date of the coin (year of issue). The other mint marks from Hyderabad include a split diamond and a dot in the diamond.
Noida Mintedit
Main article: India Government Mint, Noida
Noida mint has a dot under the year of issue (coin date).
The most important thing about this Noida Mint factory is that it was first started by the Indian finance ministry.
Noida mint factory was established on 1 July 1988.
