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Extra Metal Mint ErrorExtra Metal Mint Error
A planchet can obtain extra metal during the annealing process when there’s left over metal debris from the annealing of other planchets. The alloy debris will collect and form a flan along the edge of the planchet and sometimes this can be struck by the die and “folded” or embedded into the coin’s rim, but will still be above the normal surface of the coin.

See Flanning Mint Error

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