Here is a contemporary British India Coin Die which I recently found at a Swedish coin fair. The Die was intended for the reverse of a one Rupee coin with the date 1840.

Silver Rupees from 1840 are common. However, a funny thing with the die is that when the engraver made the date, it looks almost like 1940 instead of 1840! The weight is 307 grams and the composition appears to be steel. I'm guessing that the punishment for making a counterfeit die during this time period in India would have been quite harsh!