1991 bubble forehead dime 0

[Tosh0]

So beautiful also quite interesting this Dime I've been trying to get more info on

[Woods020]

He looked at one too many posts with “errors” and his head exploded. 
 

just kidding. It appears to be heat damage. People love to throw coins in fires, weld them, etc. high heat causes the metal to bubble like that. Just damaged. 

Edited March 3, 2022 by Woods020

[Greenstang]

See this quite often, as stated, it is just heat damage.

[J P M]

Sorry to say it looks , Cooked and cleaned

[The Neophyte Numismatist]

Agree - heat damage.