19x3 Lincon Cent, What Is This

to CCF.
It appears like this cent was in a very hot fire.

It was the rare 1983 copper penny that someone torched.

It's been damaged after it left the U.S. Mint. PMD.

I think 1973 going by the FG on the reverse. It is a PMD coin.
John1

Somebody's science experiment.

It appears to have suffered from some combination of physical damage, heat damage, and corrosion. The fuse box theory is just one possible explanation that can handily explain all three of these symptoms at once.

As I have often said:

Coin manufacturing is a relatively simple process, essentially the same as it was when coinage machinery was first invented. There are only a small number of ways this machinery can go wrong and create a variety or error. Nor is it a secretive or arcane process; it is well-known, and the possible error coins obtained from the process are likewise well-known and well-studied.

Once a coin is made and put into circulation, it can encounter a much, much wider array of possible circumstances and environments and acquire damage in many and various ways. It is not always possible to determine exactly how such post-mint damage has occurred, but the fact that it is post-mint damage and not a mint error can be assumed simply because it does not fit into any of the relatively narrow categories of "damage" that are symptomatic of a mint error.