At first glance this looked like a typical rim ding but upon closer inspection you can see some struck-in metal associated with the rim loss. I'm guessing this is an unusual struck-in rim burr.
"Pride is yoked with callous behavior, as humility is with compassion." St. Gregory Palamas
That pretty neat looking. Could there be a vertical collar crack involved as well? I'm still very new to errors but trying to learn. Maybe take a look at the opposing edge and see if there is something similar.
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