How rare is this penny? 1991 "e" on ear

1991 penny no mint mark.
There is a lower case "e" next to Lincoln's ear.
Also looks to be a double die . little new to this not sure if this could be a double ear or something completely new.
Any info on what i may have or the rarity of this coin is appreciated....

 

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The plating was broken allowing the zinc core to rot. It's very common.

 

Correct.. Not a Mint Error.
A 1991 Cent is Copper Plated Zinc.
That is a small plating issue bubble.

There is no letter e that small that would be stamped onto the surface of your Cent

 

He's referring to the CUD behind Lincoln's ear; it may resemble an e but it is a cud; esp since there is no lower case letters for cents.

 

We know what OP is referring to.
No, it's not a cud. A cud stems from a broken die and always involves the rim of a coin.

 

I see no Doubling. If you do it's most likely Die Deterioration Doubling that has nothing related to a Doubled Die

By the way.. The correct terminology is Doubled Die, not Double Die
https://en.m.wikipedia.org/wiki/Doubled_die
Quote - "Note that the proper terminology for this occurrence includes the letter 'd' at the end of the first word, hence "doubled die". The term "double die" without the first word ending in 'd' is not proper numismatic terminology." closed quote

 

NO! Not a CUD! Its a small blister associated with these Copper Plated Cents

 

I'm sorry, that's a "c," not an "e."

 

Oh thanks Rick, still struggle with what is what but bottom line is not an error.

 

Looks like an o to me.

 

You guys are blind.

 

Great.... now I have to cancel my optometrist appointment. Thanks, man...

 

I see what appears to be a fairly large die chip behind the lower part of the ear.

 

It honestly looks like an S to me. Have you figured this out?

 

I’d like to buy a vowel Alex, I’ll take an E.

 

Engraving a Cochlear implant lol