Colonial buckle or later?

[toasted]

I found this buckle last fall. Im putting together a display of all my colonial buckles and I'm not sure about this one. It was found in a colonial context but there was also a large amount of 19th-20century contamination nearby. It has the old look to me but is not of a type commonly seen. Possibly colonial horse tack as it is quite heavy duty looking too

 

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[smokeythecat]

Due to the deep patina and the irregularities of the piece, I'd think 18th century. Great find.

 

[coinman123]

Could be colonial, not a shoe or knee buckle though. Could be 19th century too though, those styles never changed much through the years.

 

[CRUSADER]

I would class it as a belt/strap slide. As it has a wide hole for 2 thick leather straps it most likely went on a horse not person.