Why are the details so sharp?

I have this 1999 penny that looks just like a normal business strike at first glance, but it has many features of a proof. Despite not having mirrored fields, the coin has extremely sharp detail and rims. Could this be some sort of anomaly or just a well-struck coin?

 

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You are looking at a normal business strike coin and it looks nothing like a proof.
Granted, it has fared better in it's nearly 20 years in circulation that some zincolns but it is definitely not nearly the quality of a proof.

 

What he said.

 

Beveled edge gives it away as a business strike.

 

Probably a newer die.

 

Probably a newer die.

 

Yup. Case solved.

 

They aren't