That looks like a failed die break. I thinks it's a type of Cud if I remember what I've been reading properly
Ovoid Cud
Definition: An ovoid Cud is a die break that incorporates part of the rim and a portion of the die's interior. Its shape will be in the form of an arc from one part of the rim to another part of the rim.
Ovoid Cud
Definition: An ovoid Cud is a die break that incorporates part of the rim and a portion of the die's interior. Its shape will be in the form of an arc from one part of the rim to another part of the rim.


























