This is a zinc cent. The bubbles on the surface of the fields is from plating over zinc dust on the planchets. It the plating gets split during the stike, the zinc under the plating will cause that area to rise when oxygen, get to the zinc. This is not doubling, just the zinc rot starting on that area. It is a spender as the coins time is counting down. So spend. No premium for a problem coin.
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