1982-2002 lincoln pennies plating

Bigcrypto

For the well trained veterans out there are these the planchet errors or man made deplating method would appreciate any input on these my other ones are diffrent black brown ugly. This last group I found are diffrent than the last one I posted wwhile back thank you all for your input.

Rooster1

Bigcrypto, those coins have been treated with acid or an acidic solution.