Last Hole Dug This Buckle

[Manknee]

About 7" down, any guesses.

 

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[Bruce R]

That's a " Seveninch" buckle, I guess.

 

[Icewing]

You might try gently removing some of that oxidation with a hammer.

 

[Manknee]

Soaked in vinegar for a while the middle is still solid chunk of rust. No idea of age.

 

[CRUSADER]

Horse harness buckle, circa 1900 give or take.