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1.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'

2.Calcutta mint has no mark under the date of the coin (year of issue). Or it has a "c" mark. For Mint marks (identification)

3.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.

4.Noida mint has a dot under the year of issue (coin date).