Adolf Hitler, who served as Führer of the Nazi Party, held the absolute highest possible Nazi Party position. Albert Speer (in his book Inside the Third Reich) remarked that Hitler was the only party member to wear an embroidered "Eagle of Sovereignty Pin" on his civilian jackets (every other member wearing the round party badge), though the jacket design itself did not differ from other civilian jackets of the time. This "Führer Badge" was the only unique insignia ever created to denote Hitler's rank as Führer.[2][page needed]