Newer coin: error or post mint damage

I happened across this and needed help. Anything is appreciated.

 

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Hello. Post Mint Damage.

 

The Copper plating was scraped.
DEFDAM - Definitely Damaged

 

Rip the penny
(Damaged jeez)

 

PMD on the obverse, but either a plating blister on the reverse U in UNITED, or possibly a die chip. Hard to tell from the photo.

@paddyman98, did you look at that? What say you?

 

The area around the U is damage. It's indented and the rim is slightly out of round. The obverse rim also has some flattening in the same area. The marks are probably from what was used to clamp/hold the cent when it had a run in with a grinding wheel

 

Your eyes are sure better than mine, but it make sense it was a possible tool mark. I just couldn't tell if it was incused or not.