Try compressing a coin. cpm9ball, posted: "Encased Cent" BINGO! Coins as this are taken out of encasements. The pressure of the strike does this to their edge: TypeCoin971793, posted: "One of those “good luck” holders? Those are struck to contract the hole and permanently fix the cent."
Too many variables to make a guess. What year is the coin? If mainly copper and not the lousy zincoln, it could be some acidic results. What is your take on it and why not show the full obverse and reverse so we have the information necessary to give an opinion?
You were on the right "track" but it's the wheels of a train that are shaped like that, not the track itself. The track is the exact opposite with the center high and edges low. Wheels are concave, track is convex. That said, there is an error known as a railroad rim. But Insider's coin aint it !
You guys need to learn what the original surface of a coin looks like. That goes for circulated coins too. Then the ORIGINALITY of the edge of this coin - except for the deformation - rules out any cleaning, abrasion, polishing, etc.
Yep...I sent a 1909 unc. cent to NGC, it came back in a body bag and they explained it was in a "Good Luck Holder"