It’s sort of unfortunate that it appears the finder began scraping off the encrustation because it tends to make the legends much harder to read at this point, but on the basis of what I think I see on the obverse, letters suggesting “…M ANTONINVS…” that can sort of be made out between 7:00 & 10:00 on the obverse, I think this may well be a Denarius of Marcus Aurelius, either late during the time he was Caesar to Antoninus Pius or early in his rule as Augustus – this based on the short, neat beard as opposed to the long and scraggly-tending beard in his later portraits. It might also be Antoninus Pius – I give a couple possible comparative examples below. Unfortunately, silver was never a specific goal for me in collecting, so the examples I have are sparse and nothing that matches yours exactly. The obverse of yur piece also appears to have been somewhat double-struck – you can see doubling in the nose – and that is seldom good news for legend readers.
The reverse seems to be a typical Adoptive/Antonine period “laundry list” of titles, TRP number, number of Consulships, etc.
On the reverse I believe that is Roma standing left, holding a small figure of Victory and spear or scepter.

 

This is from early in M. Aurelius’ time as Augustus

http://www.stoa.org/gallery/album94/ML03_M_Aurel_Providentia_den?full=1

This is Antoninus Pius as Caesar (briefly) under Hadrian and the portrait somewhat favors the profile on your coin:

http://www.stoa.org/gallery/album93/ML01_A_Pius_Caes_Diana_den?full=1

 

And yours stitched and sized in the same format:

If the details become clearer under further cleaning, send me photos and I’ll be glad to take another shot at it for you.
Mark