Same metal with environmental damage. No it is not a mint error at all. Just two cents Euro.
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Different metal on either side is it a rare minting error
M
Marc's Expert Appraisal
ANA-Certified Numismatist · Hudson Valley Numismatics
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1963 no mint Mark weights 3.1
Just a good old cent, it should weigh 3.1!
1972 Lincoln Cent weight 2.62 smaller in size
Rim shaved, perhaps. Nothing noteworthy that I can tell.
1966 dime
Dimes after 1964 are copper-nickel and worthy of spending.