This vintage Ford Motor Company hub cap, frequently called a grease cap, is attributed to the Ford Model T production era, circa 1910s to 1920s. The piece is manufactured from stamped brass and features a hexagonal top designed for wrench application. The top surface is embossed with the trademarked Ford script logo and the block-lettered phrase MADE IN USA. This component was designed to screw onto the threaded wheel hub to protect the internal bearings from road debris while containing grease lubricant.