Re: Finally got back out
Lucas was pretty close on the button. I have seen a few found and actually found one myself that was turned into a broach with a brass pin (maybe post later). Anyway, the info on your buttons is as follows from the "Record of American Uniform and Historical Buttons" by Alphaeus H. Albert. Page 23 shows only 4 variations of this button, but all are pewter, 1 piece convex style, with coat size being 19-20mm (rv10) and vest size being 15mm (rv5). This button was manufactured in between 1815 and 1821.
Congrats on the excellent find!