Looks like a 'ghost effect'. Ghosting is when there is a transfer of metal dominantly into one side of the coin during the strike. So you are seeing a surface effect of the flow of the metal into obverse die. You sometimes see this phenomena on split planchets and thin planchet strikes. It is an indirect die transfer, if you want to get technical.
British pennies were also notorious for this effect.

British pennies were also notorious for this effect.

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