Post-mint damage? Or mint error?

[hughmaster10]

I’m not too familiar with these type of coins. What do you guys think? Acid? Foreign substance? Maybe a grease error?

 

Amazon Forum Fav 👍

A Handbook of Civil War Bullets and Cartridges - Grab it through Amazon!

[galenrog]

Acidic soil for several years.

Time for more coffee.

 

[weighit]

I agree, looks like a coin I pulled out of the dirt a few years ago, looked ate up by the acids in the soil.