I really don't know. I have seen some of them on the ancients forum. but they are usually full brockages. Here is a link that shows some ancient brockages and how they happened. brockage - NumisWiki, The Collaborative Numismatics Project
After looking at that and my coin, I am pretty sure it is a die clash. It is not reversed or mirrored.
Ah, so the clash gets clashed back to the originating die. How bizarre. Here's an 1892 10c. The clash of wheat below Liberty's chin is fairly common. This also has O from ONE clashed below the ear, and leaves through the ribbon is cool.
Sure look like Julia Maesa is facing left in the image. If the dies clashed she would be facing right just like the obv.
This coin rotates horizontally, medal orientation, not vertically, coin orientation, so it would have this effect after a clash I believe.
This one looks like a misplaced MM, it's not. It is an Atypical die clash, In 1960 there was an out break and I can't remember which one it is. I will leave a link below for the tilted die files. https://www.maddieclashes.com/1960-sd-1960dsd-lincoln-cent-tilted-die-files/