Button?

[Garabaldi]

Is this a button? How old do you think it is?

 

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[vayank54]

Does it look like a small chain link going through the opening? It might be a cuff link but I'm not sure

 

[Garabaldi]

Does it look like a small chain link going through the opening? It might be a cuff link but I'm not sure

The small hole in the back does not go all the way through. The metal backing is snapped off.

 

[PBK]

I'd guess cufflink, too.

It's probably just some sort of fanciful abstract design, but the whorled pattern sort of reminds me of "fingerprint" or "thumbprint" cufflinks, like this one:

 

[Garabaldi]

I agree Cuff link. Thank you.