Buckle?

[etex]

Heavy brass buckle? Belt buckle? Sling buckle? Harness buckle?

 

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[HuntinDog]

All of your pictures show the one side (good pictures), but I would like to see the other side also.
I would say the size and heavy construction it would be for a strap on something for a pack animal.
WAG

 

[etex]

 

[A2coins]

Does look like a buckle with the two pins bent to the side