1958 cent damage question

[Mint State]

Good afternoon all,
I am curious as to what would cause this kind of damage to a coin. (over-all, not the rim damage.)
Acid dip? Dryer?
Need to better my knowledge of how some PMD occurs and how to recognize it.

Thanks in advance.

[coinguy]

It looks like acid damage. Remove it from the 2x2 and weigh it to two decimal points.
That should give you the answer.

[Mint State]

Thanks, it weighs 3.32 g

[HANDI1]

This site says:

1 cent 1958
Mintage:
Circulation: 59,385,679
Proof-like/BUNC: 18,259
Alloy and composition: 98% copper, 0.5% tin, 1.5% zinc
Magnetism: Non-magnetic
Weight: 3.24 g

[Mint State]

Weird that it's actually overweight, maybe coated?
Like I mentioned, I know it's damage but trying to be better informed on types of damage.
So many coins are passed off as errors when in fact it's damage, it's good to lean on the knowledge and advice from others.
Thanks!

[coinguy]

I think your going about it backwards, it doesn’t matter how it was damaged. Damage is damage.
The trouble with trying to identify damage is that there are countless ways a coin can be damaged
and some types will never be known unless you were there at the time. The best way is to try and
identify it as an error as types of errors are known. If it does not fit into the realm of an error,
then by default it is damage.

[Mint State]

Thanks, great idea. I do like to be able to say, "that is acid, or cleaned" etc when looking at coins. But yes, you are correct. Get to know the error types, and simply write the others off.

[troubadour]

Lookin' at that obverse scratch, 100% damaged