Your buttons are United States Infantry buttons from the War-Of-1812 period. They are shown in the book "Record Of American Uniform And Historical Buttons: by Alphaeus H. Albert, as button GI-51-J. They are quite rare... especially in non-excavated condition. I know a historical American military-buttons dealer (not me) who would pay you a good price for them.
After-posting edit:
I see my good friend Nhbenz and I posted the answer at the exact same minute.