Need Help - What Coin Is This

Well not that I wouldnt say the coin CANT be fake....id definitely be surprised if it were.
The coin has probably been in my grandparents house for over 30 years and I found it along with some Ottaman Empire coins (i could put up the pics as well here)
are you pretty sure this one is fake ?

Saurabh,

Im sorry to say it, but unless your grandparents were coin fakers and this is an original and the rest are casts, I see very little way it could be real. It could be silver, I doubt this too though. I suggest you try testing it for silver - be destructive if you like, its not going to harm its numismatic value.

I would keep it - its an excellent fake (the style is slightly off), but the real deal maker here is the patina/dirt. It looks the real deal. I suggest you buy a metal stamp and stamp an F into it, then keep it as if it were real.

Yes, sorry, it is indeed a fake, of the type listed on FORVM and linked to by Dionysos. The key indicator to me is the identical fashion the "C" is missing from the beginning of the reverse legend. Both this coin and the one on FORVM say "OS V" instead of "COS V", and there's a "hyphen" or "underscore" where the C is supposed to be. Presumably on the original coin used as the model for this copy, the poor centring highlighted by Dionysos meant that most of the "C" had fallen off the edge of the flan, and the hyphen/underscore is all that's left of it.