ID This Button?

[jsk1]

My buddy Randy found this on Sunday out in a field. We've all found a lot of colonial buttons in this field. It's a one piece and appears to be a Naval button of some kind. It is dented from the back like it was hit with something. Any help on this would be greatly appreciated. Thanks, Joe

 

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[Dug]

Early Marine Corps. looks like a MC3. BM will ID what variant. Nice find. 3B by the way the rope is fouled on the anchor.

 

[wvplug]

Nice...