Major Die Crack Or Split Plating ?

It looks to me like the split runs through the letters rather than additional metal on top of the letters like a die crack would do. I'm leaning towards split in the plating.

Some parts do look like a die crack, though. I wonder if it could be a combo of both?

With being parallel to the rim it may have been a shallow scratch during the rolling process that activated the zinc under this Cent. Note the T on UNITED? See how the T has a pothole next to it and the T appears moved on the top half. That is what I think I see on this coin. Others may chime in a well. But this is what I think happened to it. If there were more examples from the OBW roll then I would think die crack. But this looks like it could have been an outside job. (pun intended) LOL