'The Calcutta mint was established by the East India Company in 1757, but other mints in Bengal continued to be used till about 1835, when the Calcutta mint was rebuilt. The Bombay mint was set up about the year 1671, but the coins were made by hammer and anvil until 1800. The Calcutta and Bombay mints are still in operation.' (Classic Encyclopaedia website).
The Bombay Mint was engaged to assist in the manufacture of bronze penny and halfpenny coins in 1942 and 1943. Master tools were sent from Melbourne but for some reason were not employed: new tools and dies were manufactured in India.
Classic Encyclopaedia website http://74.1911encyclopedia.org/M/MI/MINT_COIN_MANUFACTURER, accessed 7 Dec 2005