Some sort of clip

[Tony12100]

Today i dug this gizmo. Its brass with a spring. About an inch and a half long. Has a chain attached.

 

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[Back-of-the-boat]

Makes me think of old Clip on earrings.

 

[nhbenz]

1950's glove/scarf clip perhaps?
vintage glove clip chain - Google Search

 

[Bruce R]

Hung from your window frame and held back your curtains.