NOT A BUTTON OR CUFFLINK--THEN WHAT IS IT??

[36coupe]

Typical interesting item looking the usual looks familiar however have no idea.

Circular business looks brass and the back metal not sure and slightly broken.

Round brass will spin nicely.

Must have had some use. Any ideas. Thanks for looking.

 

[mcl]

Best guess for me is a drawer pull knob.

 

[bradyboy]

first thought its a riveted item, maybe for clothing
Button?
Brady