dime help

[warworn]

Hey there found this dime wondering if its PMD or maybe a flaw planchet? Don't know how to properly describe the damage, kind of looks like an acidic material may have come into contact with the coin prior to minting. Thanks any help is always appreciated.

[coinguy]

PMD
Looks like corrosion.
Maybe from being buried in the ground.

[troubadour]

Corrosion.