I have no idea as to the
identification of this coin, but as there seems to be no
patina on the visible parts of the coin, this is a perfect example of a coin that needs a dremel and a soft bristled
brass brush... You will remove the black crud, expose much more detail, and enhance the coin no end..
Of course it will be shiny and unattractive after the treatment, but you can retone the coin with Jax or a similar product, or just wait, and let time do it's
work... Either way, I think you should seriously consider doing some
work on this
poor little coin!!
Best wishes,
Lee.