1967 lincoln penny, error or postmint damage?

Hi, Im new in this forum...& relatively new to coin collecting. Coin roll hunting (pennies) right now, & wanted others opinions on this one.... error or postmint damage?

tried to take a couple different pics from different angles & with / without flash....

specifically im looking at the U in trust...you can see like an outline of the bottom but its not complete

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Looks like the U took a hit from another coin or something.

 

PMD - Post Mint Damage.
Circulation wear and tear.

 

thank you both