1942 P Jefferson Nickel

Robinson1990
For a true identification pictures are a must.

here are pics

Looking at the last two pictures above it struck me that it sure looks like the coin was at one time graded by a TPG. It also seems that the edges are suffering from a build up of dirt.

I'm not an expert, but this is was it appears to be in my opinion. If the coin was struck on a penny plancet I would expect to not see any rolled edges as the whole piece would be taken up by the Jefferson die.

At this point I would probably send the piece to a TPG for authentication. Coloration and weight appears right for what you propose but the edges for me are problematic to your theory.

it looks like dirt in the pictures. but it is actually metal burns. looks like it got partially melted almost. it just isn't dirt, if my camera didn't suck you would see what looks like gunpowder burns in a way. hot metal blasted copper look. very odd. but it looks like it all was in the minting process. strangest specimen I've come across in many year. guy I got it from wanted to buy it back and told me to send it to pcgs immedietly.

What will the meat under the metal look like if held to an open flame?

Same effect.

Open area exposed to flame will look one way and covered area will look differently.

In the one image the edge looks silver-ish. grey whatever you want to call it. could this be a case where someone tried to plate a nickel with copper, or maybe that plate a nail with a penny experiment to get a copper nail, then plate the nail with a nickel to give it that sacrificial nickel coating, but someone used a silver nickel instead of a cupro nickel one, and the copper nail plated the silver nickel instead? that is the only thing I can see to be the reason the spot on the rim/edge of the coin is grey where the "square" reaches the edge.

That or someone tried to make a silver-battery using the nickel with small copper plates stuck to it and in the end ended up with a plated and corroded coin? too early for chemistry type things this morning, but those are my guesses if it is a real coin.

Again, being above 5 grams makes this a non-starter for a cent planchette error. Being over 5 grams, even of slightly thicker, makes it unlikely to be solid copper as the laws of chemistry say that silver by volume has more mass than copper. By that measure this coin should weigh less than 5 grams if made completely of copper. Based on the "weld marks" along the rim, the dirtiness, and pattern, my guess sits with this being a copper plated nickel that lived a large part of its life in a piece of jewelry.