Looks like very minor plating bubbles on a copper plated zinc planchet cent. Nothing really major. No premium for that. Question. Are you looking for errors to make money? You will learn that you will find many coins in circulation that have very little or no premium at all.
the zinc/copper plated are even lowest of the quality many times. What MAY look like errors are just poor quality planchets, then moisture and circulation adds to the illusion.
Yea, it’s a grease filled die and this is a known weak spot on cents when minted by a worn die. Very common.
IMO everything looks normal for a circulated cent. Every coin in circulation get's nicks, bangs, and scratches. Sometimes effecting the letters and numbers to look like errors. Most are not mint errors in circulation.
That is called a floating roof. The dies were over polished taking away the reverse details. No MM means that it was minted in Philadelphia.
Floating roof and missing initials is caused by an over polished die. Nothing major and no premium for that also.
This is quite common on zinc pennies, at least for me it is. I find on average one like this once a week in my change.
What you have is a good example of what junk the Zincoln cents are. Plating issues are common and NAV, no added value. If you like examples of "odd" coins, by all means keep it, but it may not survive very long.
I voted YES on your 1983 D cent. It's worth one cent. As for your 1969 floating roof. It is not a 1969 D, missing the mint mark. It's minted in Philadelphia. Philadelphia doesn't put a mint mark on cents.