Pretty sure it’s a nail. Wondering if anyone can approximate an age.

[BABALONGOGGLES]

Found this in a place with no real history that I could find on maps, but I don’t think I’ve seen a nail with a rectangular head like this.

 

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[smokeythecat]

It looks like a floor nail, they had heads like that. Probably post Civil War.

 

[Tony in SC]

Could be an old horse shoe nail.

 

[creskol]

Could be an old horse shoe nail.

Agreed .. a horse shoe nail.