I have a 1990 P, U.S Nickel which had it's obverse (i.e. - "heads" side) side leveled flat by (in my limited knowledge of this type of error) by being jammed in some precarious area of the various minting machines. The heads side is flattened off to a perfectly leveled surface except for a small portion of the coin where it looks like it got jammed up (on the side of the intention) and held it there for who knows how long. The reverse side of the coin looks like it has "normal wear and tear" on it just like about every other nearly 20 year old coin that's in circulation has.
Until now, I've never seen anything like this in all of my over 40 years of coin collecting.
Does anyone have any idea what this coin's type of error is called, the rarity of it, or have any other information on this type of error coin?
Here is a photo of it.

Thank you ever so much,
Toddly ☘️













