I dont think its a button

[Tommy G]

I don't think it's a button

I was hunting a home site (the colonial era home is still standing) and found several flat buttons, buckles, etc. I thought this was going to be another button, but the shape threw me off. It is a hollow, half sphere with a prong or peg in the center. The peg is solid, slightly curved and leaning forward. I could tell it wasn't bent, but rather designed that way. Looks like lead in the photo, but is much harder. It had a light green patina on it when I first pulled it out of the ground. The AT Pro indicates that it is most likely brass, but I have no idea what this is. Any ideas?

 

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[DCMatt]

Brass tack?

 

[Tommy G]

Possible, I suppose. The prong is pretty much flush with the rim, so unless the prong was much longer and sharper at one time it would be difficult to tack anything with it.