Not possible.. If another coin was stuck to it, then why are the mirror image letter raised?? That wouldnt happen if it was just one coin stuck to another.
Let's put it this way. There is no event during the minting process that could have resulted in the coin you see. It looks raised because the design is embedded in glue, and the glue is attached to the surface of the coin.
http://www.coinworld.com/insights/voices/lincoln-cents-with-outlines-glue.html And take an especially close look at this thread, your coin looks very similar: https://www.cointalk.com/threads/what-is-this-huge-error-help.219252/
I agree with the others that said glue , this is definitely glue on your coin. some types of glue will not come off easily even with acetone. don't feel bad,a lot of people get's tricked with dried glue and other gook on coins.
Well I wish you guys could see it in person.. then you would be flabbergasted! NOT GLUE! Tested positive for copper and iron. Took it to lab at local college and they said its definitely not glue or any other adhesive. Its the clad and its
the lab told you wrong , this is glue . I have seen this hundreds of times on coins I find and coins on this forum with the glue on them. some folks even swears it is not glue and later on they always find out it is glue. one guy on this forum was so convinced he had a awesome error he sent the coin to a error expert to only find out it was glue. why are you only showing one side of this coin ?
Not sure how many times it's worth saying...but this coin COULD NOT have come from the mint like that. The first indicator is the mirrored lettering. The only other error I can think of with mirrored lettering would be a brockage, and that would completely destroy the underlying design. And second is the odd appearance of extra material on the coin. If it is an error, how can we possibly see through the strike to the underlying design? That doesn't make sense. It looks like a translucent material imbedded on the coin.
Uh, unless I'm mistaken, I'm pretty sure post-1982 cents are made out of 97.5% zinc with a 2.5% copper plating, no iron. I don't think the lab is correct if they told you it was copper and iron.