I dream of getting into the 1700's club someday...You guys on the east coast have the opportunities to find those old coppers in your back yards. Congrats for swinging your coil over a few nice keepers.I dream of getting into the 1700's club someday...
There we a lot of coppers with the KG3 head on it so I would not fixate on one particular. If it's a worn specimen the 28mm diameter was likely just larger when minted. I don't have any numbers in front of me but I believe Vermont coppers are slightly smaller. KG3 coins are about that diameter.
Try and get the weight, diameter, and a pic of the obv and you'll likely get an ID.
My guess right now is it's a Cartwheel. The last pic shows a big edge.
Steve