Rosette, Button?

[Stoneworx]

Found this at an old home site near Richmond Va. Any idea what it is? Its as big as a rosette. But, it has a button shank... New to relic hunting and just looking for identification. Thanks in advance!

 

[Gaspipe]

From the second picture if that's a shank then its a button.

 

[trapperart]

Yep looks like a button

 

[Trezurehunter]

And one big button at that !