Please help identify this object

[Mr Patty]

 

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[releventchair]

You could look up ,square eye trigger snap.

For the end of a dog ,or horse ect. lead/leash.
Just a guess.

 

[Mr Patty]

Wow that's a heck of a guess. Looks just like one of those but the round part is cast solid. Doesn't look like it was made to move. Thanks for the reply