Coin ID

I think there is nothing that can be done. It appears that all the details have been tooled off in an attempt to clean the coin. I would suspect that this was a Kushan coin at one time

The Empire of the Kushans (Afghanistan, Bactria and North India Bordering China)
Soter Megas - The Great King
Vima Takto r.c. 80-90 AD
AE Tetradrachm 20.9mm (8.42g)
Obverse: Bust of Vima Takto with Royal Greek Headband and the Magic Stick (scepter) Three Pronged Tamgha behind.
Reverse: The Great King Mounted with Scepter and Corrupted Greek Legend BASILEY BASILEYWN SWTHP MEGAS- "The King of Kings- The Great Saviour."

This will clean up slightly if you're careful with it. Store it under oil annd in a few years something might present itself.

From what I see, it is certainly a roman sestertius (S-C across a female figure, standing left, probably holding a patera), probably Antoninus Pius to Septimius Severus.

What you see here is a metal core with fragments of the patina left on - its not fared well underground so most of it has crumbled away, leaving a mushy shadow of the design underneath. The bit you think is a hand is really a patch of remaining patina - careful cleaning should yield a flat and empty piece of the field (and really careful cleaning of the reverse will give you a bit of drapery on the central figure).

A long soak in olive oil or distilled what should remove some of the crud. You might see enough detail to make an ID than.