I founded in pocket change this coin 1990 D . I am not sure If is it error. Blistering is considering . Maybe Abe got chickenpox, Let me know , thank you
I agree- ordinary coin. And, your poll didn't give any options to vote on. Maybe and perhaps are synonyms. Try inputting- "Error? or Not error?" for example into your poll when you set it up.
There are numerous, but minor, copper plating 'bubbles' on the cent. Not really an error, more of an anomaly. This is a fairly common look on these copper-coated zinc planchets.
Yes, normal Lincoln cents are smooth- metal fatigue is not typical. However, what occurred on your coin occurs on many others, and does not give it a premium.