That penny looks like it's led a tough life, as the king has a mutilated ear. Post mint damage ( PMD) maybe cracked as a result of intensive heat would be my guess.
It's definitely not a die crack because the crack then would be raised.
"A die crack occurs when a die, after being subjected to immense pressure during the minting process, cracks, causing a small gap in the die. If this damaged die cointinues to produce coins, the metal will fill into the crack, thus revealing a raised line of metal in the finished coin." https://en.m.wikipedia.org/wiki/Die_defect
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