Merged the duplicate threads. As mentioned, that is a modern zinc cent that has been severely ground up. That is all. The damage exposed the inner zinc core. Post-1982 cents are mostly zinc, with only a thin outer layer of copper. This zinc core gets exposed any time the copper plating is scratched or scraped away (or filed, as in this case). Someone did their best to murder that coin, and did a good job of it.
Has anybody ever tried to scrape the copper off of the raised details only to create a 2-toned coin? If done right, it might look cool. The obverse of the OP’s coin made me think of that.
I'm sure they have. Done tidily enough, it would indeed have an interesting appearance. I have seen some which were artificially worn down to AG03 or FR02 grade which had that interesting sort of "faux cameo" look. Of course by the time you've applied that much abrasion, Abe's silhouette has lost all detail and sometimes even the outer edges of the portrait become undefined.
When I was in drafting class in high school, we had hand held electric erasers that used Pink Pearl eraser inserts. I'm thinking one could use that with SOME control and with enough pressure MAYBE wear off the copper on the details.