1962-D Lincoln Cent - One for the Error Guys????

I was searching through some rolls of cents this week, and when this one hit the table, it had an odd "ring" to it. When I examined it closely, I determined that the planchet is about 2/3 the thickness of a normal one. It feels extremely light, and of course, the strike is very "soft".
I'm thinking that this was struck on some sort of planchet intended for a foreign coin. Anyone have any ideas as to what the Denver mint was striking for other countries in 1962? Perhaps the sheet that this was punched from was rolled too thin, but I'm not sure about that.
It "feels" and rings like a Canadian cent of the 1982 era, when they were still mostly copper, but very, very light. Is it worth keeping or sending in for authentication?

I'm thinking that this was struck on some sort of planchet intended for a foreign coin. Anyone have any ideas as to what the Denver mint was striking for other countries in 1962? Perhaps the sheet that this was punched from was rolled too thin, but I'm not sure about that.
It "feels" and rings like a Canadian cent of the 1982 era, when they were still mostly copper, but very, very light. Is it worth keeping or sending in for authentication?


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Comments
otherwise known as 'acid treated'.
It's an alteration, not a mint error.......
I believe that that would be the only candidate for that year. I do not know which mint manufactured
for Korea or if all of them did.
It also may just be enviornmental damage or some other answer.
bob