Mechanical or a cuff link ? Or what?

[jgas]

Once again I ask the pro’s for help with this mid 1800 field find. Small and what appears to be gold plated with a design. I have no idea. Thanks for any help. Jags

 

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[DCMatt]

It's a shirt stud sometimes called a bachelor's button. Late Victorian era.

 

[Bigcypresshunter]

nice ID