That's an old copper from the Bombay Presidency of the East India Company. Looks like the date is mostly off-flan, below the heart-shape. Not sure which denomination; looks most like the 2 pice (KM 200) or perhaps the 4 pice (KM 201).
As for the countermark, it looks to me like the coin has been turned into an apothecary weight. I think it says "10 drams", with the funny 3-like thing the symbol for a dram. If so, it's possible the coin may have been clipped down to bring it to the correct weight.
Does the coin now weigh about 38 grams? The 4 pice coin originally should have weighed 42.5 grams - that's a lot of copper shaved off just to make a weight.
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