I think it might depend on the local practice in the mint in question; some mints would have used specially-made half-rupee dies, others would have used a generic die for all denominations. It probably depended on how often fractional rupees were struck at that mint - some mints made lots of half-rupees, some made none at all. A mint that only rarely struck half-rupees would probably have simply used a regular rupee die pair, when the need arose.
Don't say "infinitely" when you mean "very"; otherwise, you'll have no word left when you want to talk about something really infinite. - C. S. Lewis