Pardon me please, but it is not a General Staff button's front. It is the front of an 1854-through-1874 US Army Enlisted-ranks "General Service" button. See info and button GI-94 on page 40 of the button-book by Alphaeus H. Albert. Additional info: In 1875, the General Service button eagle's form was changed somewhat, and the shield on its chest became "raised." See Albert's book page 41 for info and button GI-98.