1991 Lincoln Cents Error coins

I could not help but notice these 2 coins when I weighted them.. The 1991D weight is 2.45 grams and the 1991 weight is 2.47.. They appear smaller than usual.. I was so tempted to clean them with soap and water but I resisted.. They are thinner on on side of the rim then the regular one Cent.. Is this some kind of dime/penny mixture?? I don't know what to think because they both appear to have a bit of silver dime color to them..

 

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The bottom one appears to be a 1994.. Not a 1991..

 

erosion -- a metal detecting coin

 

Environmental damage. Not an error.

 

They are Crappy Zincolns which have just a very, very thin layer of copper plating over the zinc.

 

damaged coins worth 2 cents

 

this thread may give you a heart attack ... so read at your own risk.
https://www.cointalk.com/threads/zincoln-alka-seltzer-and-my-1-558g-zincoln.357491/