The Uniform Coinage of India 1835 to 1947 by Stevens and Weir is a good reference - it says that 24,144,000 1947 Bombay 1/2 annas were minted but gives it an equivalent value to the Calcutta.
The David Fore Collection of British Indian coins (which was very comprehensive and was sold by Baldwins) didn't seem to have an example though (at least not in the sequence of regular coins).
I wouldn't be surprised if a lot were made and subsequently withdrawn (or perhaps never even issued).