Some rolled in debris left, some got hotter than the plating. Above ONE CENT.

.... on this doubled PLURIBUS 1983 Lincoln Cent.

 

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That looks like occluded gas to me.

 

Yup. It is 2.6 grams, so the early proof 1983’s that received two platings had the strength to hold it in.

 

This double plating early proof 1983 Lincoln Cent reference comes from NGC’s early 1982 Zinc Lincoln Cent article.

 

1983 was probably the worst year for this type of plating problem.

 

I heard that when they went to zinc they had problems with dies because of the metal it flows differently this went on for years also for the plating because now how many good nice looking zinc coins are there. You will notice it seems like they tried different things smaller dates different color platings I just love that deep red one they did. As time goes goes by it is getting harder to find good condition pennies because of ZINKZILLA.

 

Smaller dates? I didn't know that.
Deep Red? Amazing! I would love to find one.

 

Maybe you just haven't noticed right now I have in my hand a 2005 D the date is smaller than other years the color is a deep gold red not as many in this color for this year not the same as your regular red ones.

 

Your cent is not a proof it is a business strike.

 

Just plating issues. I think you forgot to put your glasses on.