This early 20th-century automotive grease cap was manufactured by the Buffalo Wheel Company for their proprietary Buffalo Disc wheel line. The component is cast from brass or bronze and features a hexagonal top designed for wrench application. The top face is embossed with the company trademark depicting a bison in profile above the word Disc in stylized lettering. The interior is threaded to secure onto a wheel hub. Such components were typically used on a variety of American automobiles during the 1910s and 1920s.