Revolutionary War 3rd Foot Guards Scots Guards coat button.  The front has much original soldier applied black enamel and the reverse has a little here and there.  The front features a rayed circle with a thistle in the center flanked by a 3 and a G.  This button is B3G.d. in Troiani’s c.2001 Military Buttons of the American Revolution book.  It measures just under 24mm in diameter.


Images and description courtesy of Beltplates.com at: http://beltplates.com/3gcoat1.html