My son was going through the loose change around the house and found this. The edges of the hole are flattened like the edge of the coin. If you look closely, there's a second pin-hole on the front of the coin but it does not go through. Seems strange that there would be a flattened rim around both sides of the hole if it was post-mint (I'd think that all the material being removed from the coin would show up on one side of the coin, and not both). I'm 0% educated on these things... thoughts?
Thanks,
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as a former machinist, I would say it was drilled through and then counter-bored on both sides. Counter-boring has the potential to push material up on both sides especially given the copper core. Copper is very well known to expand under heat and then shrink, grabbing the bit. The second hole looks to be a center punch mark.
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