I was leaning towards a 1994-D Lincoln Cent struck on a Nickel Planchet until I saw the pics but now I am really not sure what to think! Although the rim appears slightly larger than normal, it doesn't seem large enough nor does there appear to be large enough of a void between the rim and the lettering/details to be a Cent struck on a Nickel Planchet. Besides, it appears to be a Zinc Planchet versus a .750 percent Copper and .250 percent Nickel Planchet for minting Nickels. If I had to guess without seeing the thickness of the coin, I would say that the Copper plating was removed with acid, then the coin was squeezed in a vice between two pieces of leather and is a man made Error made to deceive an unsuspecting Buyer.
Frank