I Should know, but don't

[pistol-pete]

found this in an 1880's mining camp. Exactly what is it? Thanks in advance.
It's brass

 

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[DCMatt]

Ladies fashion dress sash/belt adjuster. Late Victorian.

 

[Sheperdess]

Or maybe a hair clip. What's the back look like?

 

[pistol-pete]

Here is the back

 

[dozer dan]

Looks like a suspender Stap slide adjustment

 

[invent4hir]

Wow! That is in great shape!