1999 Penny - Strike Error or PMD?

1999 Penny - the left side (left of lincoln's head) is missing the rim. Is this a strike error or general wear?

 

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It is quite possibly a tilted die strike which can leave weakness of the strike on one side of the coin. It looks like sort of like a mis-aligned die strike also.
Can you show a reverse photo?

 

It looks like only one side is affected:

 

Thanks for the photo. Full strike. Close AM.
A tilted die can also come into contact with the collar die which can wear the edge of the hammer die off to the point that it shows no edge/lip to the field.

 

So, I'm guessing this is a relatively minor, somewhat common error.

 

Yes, very common.

 

Just a common abnormality.