What is this?

[Elanger]

Hi everyone,
I found this in my daughter's vintage button box. Does anyone know what it is?
Thanks!

 

[Racked Vintage]

It may be a button cover.

 

[Rue_de_la_Paix]

Could be half of a dress buckle. Maybe 1930s.

 

[denisebrain]

I would say half a buckle as well.

 

[Vinclothes]

Agree.
Marian

 

[Linn]

Agree - 1/2 of a dress belt buckle. C.1930s.

 

[Elanger]

Ah, yes— now I see! I found a picture of a dress buckle with a very similar back for reference. Thanks for all your suggestions!