1991 p(no mm) Lincoln penny/seems to be no copper yet weights 2.5 exactly. Go figure?

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No, I don't know what I am looking at, but I can tell from your lifeline that you have not been on Cointalk very long.

 

It appears to be missing the cladding layer after it left the US Mint and is damaged.

 

The copper plating is only 8 microns thick and does not add much weight.
Your coins surface looks quite grainy like the copper was removed chemically.
18 years of exposure to the environment could also make the surface look grainy.
I don't think there is any way to prove that it came from the mint unplated, so it can not be called a mint error.

 

Copper plated zinc cents are plated not cladded. Different process.
(Just trying to help)

 

Meow thinks the same.

 

Past tense of clad is clad not cladded.
(Just trying to help.)

 

Thanks.. I really appreciate the correction!

 

But.. You forced me to go investigate!

The Oxford definition -

 

Maybe it's just a British definition?

 

Other than a slight MAD I'm not seeing anything other than a single one cent coin that worth face. It appears to. E damaged as the thin copper layer has been removed after it left the Mint.

 

I knew it did not sound right to me for some reason.

 

How about...”cladditated”?....or, maybe “claddilicious”?

To be most correct, the OP coin is “non-cladditated”...or, since it appears it used to be plated and now isn’t:

“unplate-alated” [past tense]...(smile)...Spark

 

I think Aluird is calling you a Cad............

 

I just added cladded to my dictionary. Thanks guys. LOL

 

I think it is a chem lab 'silver' cent as it looks plated with zinc. On the reverse , you can see a small copper triangle that might be from an electrode tip. and the surface looks irregular, IMO, Jim

 

I think it has been decladified.