Revolutionary War dug silver coin from an American camp

Revolutioanry War camp dug Spanish silver coin dated 1780 and dug in an American camp in the Hudson Highlands of New York.  A hole was punched in the top during the period to suspend this from a string or a watch chain. The hole is broken and the soldier lost it to be found 200+ years later.  A really great perosnal item from a soldier of Washington's army.