Put your thinking cap on but don't think too hard... Describe what you see on the edge of this Lincoln cent to someone who cannot see it.. Then tell what could cause this effect and what did you see on the edge to come to that conclusion.
What I see is an unusual concave edge. Normal striking in a collar would not allow this, as the collar would fill normally under pressure. Short of being a fake, I am not aware of what could cause this. Is this what you were looking for @Insider ?
YES! Good eye. great description too: medoraman, posted: "...unusual concave edge. Normal striking in a collar would not allow this, as the collar would fill normally under pressure."
So it's shaped like railroad track? Where the center part of the rim is lower than the edge of the rim?
An un-natural concave edge possibly because the rim was abnormally raised and the metal was unable to flow correctly when struck
It seems like everything related to "mechanical" during the minting process would create a bulging/rounded rim... not concave rim.
Perhaps BUT... What would a polished edge look like? Is the edge of this coin original? Is there any evidence of polishing?
Dryer, escalator, coin counter, or any other rotating machinery. Of course this should be obvious by looking at the obverse and reverse of the coin. Due to the uniformity of the concave edge I’m guess a lathe. May have been in a lucky penny token at some time. Just a WAG.
Just a guess but maybe part of the collar was worn or damaged. Sticking around for the correct answer(s).
I was thinking he meant a round mount that can be tightened once the coin is put inside. Someone placed the coin in, then overtightened it and it stayed that way for decades. Now, why someone would put a Lincoln Cent in a bezel would be beyond me.....