This coin has some flaking exposing its core. While all the fourrees I saw online had a copper core with a soft surface, this coin looks pretty sharp with a silver core! so what you guys think?! m antoninvs avg germ trp xxix imp viii cos iii 2.80 grams. This coin lot from catawiki also looks similar in condition https://www.catawiki.com/l/29649727-roman-empire-lot-comprising-two-ar-denarii-marcus-aurelius-ad-161-180-diana-ric-212-felicitas-ric-59-silver
That is a lamination flaw. It happens as a result of a flaw in the flan, such as incompletely mixing the metal in the alloy or a foreign substance such as dirt or gas being trapped in the alloy, which causes a layer of the coin's surface to peel or flake away before, during, or after striking, leaving a smaller or larger depression in the coin.
Lamination flaws are common and, while not proof that a coin is genuine, they do not indicate that the coin is a fouree or counterfeit.
Reminds me of the Olympic champion whose parents were so proud of his gold medal that they had it bronzed!!!
Sorry, I didn't think this one needed explaining, but back in the day, proud parents would have special items (such as shoes in which their baby took its first steps) bronzed & put on display. (If you care to research this, Google is your friend.) So, when you described "some flaking exposing its core" and "this coin looks pretty sharp with a silver core!", that was a natural set-up for the joke. Hope that clarifies the confusion.