The coin has the appearance that it was subjected to some type of corrosive. It could have been intentional or accidental, who knows! I believe that what you see as a Die Crack from Lincoln's nose to the rim, is actually a lamination crack. Remember, a Die crack will show up as raised on a coin's surfaces (fields, images, lettering, Date and any Mint Mark). A lamination crack will be level with the surfaces or below the surface unless the lamination peels and begins to separate or fold over. The piece making the "5" in the Date appear almost like a "6", is a Die Chip.