Hello neighbor. Been in a few sites here in Rhea County that have produced dozens of flat buttons. Most of them are plane but on occasion find a fancy or "DANDY" button. Did get lucky and pulled a couple of "Jackson Victory" buttons last fall. They are a great way to give you the general idea of a sites age. Here in TN flat buttons are a bit less common due to the fact we were settled MUCH later than the New England states. Great relic. Congrats.
You should put a modern penny or something beside it for scale in a picture. I found a few 18th century dandy buttons but none with a design. They look huge compared to most flat buttons i have. Great find and hit that site hard if you didn't already!
Hi ACE350; Nice Find. It is a nice Sunburst One Piece Coat Button circa 1760 - 1790. Shirt buttons were smaller. If you can make out the Makers Mark on the back and any possible lettering on the Front Center Crest. I an then tell you exactly when and where it was made. Its rarity and possible value ok. I await your reply ok. PEACE:RONB