1989-P Nickel, Possible Tilted Strike (Vertical Die Misalignment).

Interesting find.

nice Brand! what does the rim look like? Is it a partial collar too?

When I found this nickel, a tapered planchet was my first thought, but the mass is exactly 5.00g. I suppose it could still be thicker on one side and too thin on the other.

The letters in the flattened area really do look like they experienced metal flow from the strike. I guess that could also be a result of extreme deterioration melting the die face. Nickels are pretty tough, so I think if it had been scraped by external mechanical force, it would have left more noticeable abrasions.

What about a wide collar error? If the coin were slightly wider than usual—or not perfectly round—I don't know that I could visually register the difference. The reference images do seem to show a weakness along the coin rim.

https://www.error-ref.com/wide-collar/

Very interesting!