I have a few coins I can't identify, all look to have fairly similar markings. This is perhaps the best example. Best guess I can come up with is some form of Mughal coin? Do you reckon this has been cleaned (or even a fake) or is it just a non-reactive metal of some kind - bronze?
Copper Pice of India, Bengal Presidency. Definitely cleaned. http://www.ngccoin.com/poplookup/WorldCoinPrices.aspx?category=132074&worldcoinid=333544