✅ SOLVED What kind of buckle is this?

[Squirrel322]

I thought this was a shoe buckle but it’s apparently not. Any information would be great!

 

[creskol]

one of these

 

[ANTIQUARIAN]

Creskol nailed it or in this case 'buckled it'.
These were often worn inside the waist of pants, they were used to tighten or loosen the waistline.

Here's one I found years ago.
Dave