I've seen other coins display similar gouges. They sometimes look like the markings from a vice grip or a pair of pliers. There's nothing on the other side though. I call them railroad tracks. Is this a planchet error or PMD?
This is an error. The coin was struck through some sort of debris . . . quite probably a piece of scrap bronze strip, as appears evident from the retained scrap below UNUM.
Its cool to think about how long this coin was in circulation before it was pulled as an error coin! Fun coin, congratulations. Reed.
The lamination presented by the OP is not a struck thru like the one Islander posted, they are two different types of lumped in errors. Islanders is a piece of debri left from a separated lamination and struck to the next coin. While the OP's coin has simply lost the lamination after it was struck.
The area with the crack under UNUM and to the right of the E in ONE is a lamination while the remaining area in question is a struck through. That is a very nice Mint error coin. Shame it's worn but that tells you what collecting and what the value of money was like almost a hundred years ago.
