✅ SOLVED Buckle?

[Confederate74]

Found this at a site where a military school was back in 1893. Not sure what type of metal it is.

 

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[duggap]

I've not seen one exactly like yours, but I am betting it is a keeper for a belt plate.

 

[Montana Jim]

I've not seen one exactly like yours, but I am betting it is a keeper for a belt plate.

I agree. It looks like a (sling/belt/webbing/strapping) slide buckle piece. Maybe half of a two piece, the small square being the female end.