I was going through a few old nails that I found recently. This one caught my eye. It appears to have a design on the head. It looks like an O. The design is intentional. It isn’t from a nail set, or other damage. The nail is rectangular and the end is broken off. The head is slightly off-center. I don’t believe it’s a horseshoe nail. It looks too thick and doesn’t have a beveled shoulder. Has anyone seen a nail head line this? Thanks