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1972 Lincoln cent 2.5 g

Pardon the ugly coin but this 1972 Lincoln appears to have been done over another coin that weighed 2.5 g. Has anyone ever seen or came across anything similar. Thanks
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The missing weight is from corrosion. Might be metal detector find???
I agree. The low weight is from corrosion and/or acid.
Likely just corroded.
Just another corroded cent. No numismatic value.
Salt water will do it.
I agree...corrosion is the culprit.....Cheers, RickO
Thanks guys. Appreciate the opinions. I’m holding out a little hope that I have a coin minted over another. The picture looks bad but in my hand not so much. It still has the slick and a little luster to the naked eye. Odd how it lost exactly enough weight to make it 2.5. Maybe I’ll post something about my actual findings when I return home from my travels.
If you put a cent in nitric acid, it will dissolve the surface away. Initially, very uniformly, eventually it gets a little grainy as that one appears to be.
I'm not sure why you are obsessing over 2.5 g. 2.5g is exactly as likely as 2.671 g, it's just a number. What planchet weighs exactly 2.5 g that you think this was struck over? 2.5 g as a wrong planchet cent isn't possible 10 years before they introduced that. Is there a foreign coin you are thinking of?