shoe or knee buckle?

[CAP]

Dug this buckle in a known 1700's site. But I am confused as to whether it is a shoe or a knee buckle. One reference states it is a variety of shoe buckle mfg. from late 1600's to 1720's. Another that it is a knee buckle.
Both state it is an anchor buckle.
Any help in identifying it would be appreciated.
CAP

 

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[smokeythecat]

Probably a shoe buckle. Over time they got larger in size, so this is my best guess.