Any guess on this tool?

[Qwest]

Found this on an old farm pasture, its iron and looks pretty old, but I have not seen anything like it before.

 

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[Back-of-the-boat]

I think it once was a threaded end for adjustable linkage.

 

[HuntinDog]

Hing pivot for a gate.
Drive it into the post and hang the other half with the pin, on the gate into it.