Inherited Collection #6

I'd start with multiple baths and soaks, see what loosens up.

Than you. I guess it is impossible to identify the coin in this condition. The top picture looks like a man and there's some letters going downwards on the right side, Greek letters?

It's not silver. Uncleaned silver coins don't generally look this bad. It will be bronze.

And yes, it's Greek. To the right of the standing figure is the word "BASILEOS" in Greek letters, meaning "king". This dates it very roughly to the period 300-1 BC, but unfortunately it doesn't help in identifying it any further, as practically every bronze coin in that period named the king. There will be another word to the left, the king's actual name, which is unreadable in your pic.

I'd suggest go easy on the cleaning, at least at first. This kind of sandy "desert patina" is highly sought after among ancients collectors; the coin will be more valuable if as much of it is left on as possible. The general rule is to clean coins up until the point at which the coin can be positively identified. This coin hasn't quite reached that stage yet.

sandblast it. Like dissolves like.