1956 1c Lincoln wheat penny

When a coin is this dark with gold dust on it does it mean it's an old proof coin? ...

 

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No, it means it's just a worn coin.

Proof coins are specially made, so all of the details are sharp.

 

Even if it was an impaired proof, which it is not, the tell tale sign would be a squared rim instead of rounded. This is a normal business strike.