That is called a die chip. It's not an error, it's a die event. A small piece of metal has broken away from the die. Die chips are very common and add no value to the coin.
If the planchet goes in a 3.11 Grams, it comes out with 3.11 grams. A die chip allowed that area to be filled with the void on the die. (The shape that broke off of the die) Just a copper melt coin. No premium for this die event.
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