Deno,
I am going to retract my guess on this being an early Naval button, and agree with CC Hunter.
I was not familiar with the forage cap button (I'd never seen one until today).
The picture of the cleaned button that you added clearly shows the detail of the shield, which is identical to a forage cap button. The shield on an early Navy button is a little bit different design.
Good call CC Hunter.
KY Relic Hunter