1900 South Dakota post office site find

[highnam]

1900 South Dakota post office finds,
US Army button and a mystery piece, my first thought was a hair clip?
the material in the settings seem more like stone than glass, maybe a slight blue tint in color.
The back of the clip has broken attachment places on each end.
Anyone seen anything like it?

 

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[tamrock]

I'm thinking maybe an antique bar pin. Is there any evidence that a pin was once attached to the back?

 

[highnam]

I'm thinking maybe an antique bar pin. Is there any evidence that a pin was once attached to the back?

Thank you, tamrock
I meant to show a pic of the back…
Never heard of a bar pin, I’ll have to research that!

 

[Hunk-a-lead]

1900 South Dakota post office finds,
US Army button and a mystery piece, my first thought was a hair clip?
the material in the settings seem more like stone than glass, maybe a slight blue tint in color.
The back of the clip has broken attachment places on each end.
Anyone seen anything like it?

great saves for sure, thanks for posting