Kind of a rotary tooth brush with stiff bristles or a Dremel tool? (whatever it was, it had to be small) I'm kind of surprised they didn't go through the plating.
i think cwb is right , you couldn't use a drill or tooth brush? on them zinc dates without taking off the layer, look at liberty - without a doubt you would see the zinc ? ..had to happen during the press ? ... I'm no expert though...maybe the person useing the press put his sleeve over it ? ...hahahahaha .. ...thanks.
Dryer Coins can get beat down like this without exposing the Zinc, maybe something similar happened to this coin. The reverse doesn't look quite right either, but the top right of the obverse appears okay, so maybe it was protected.
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