This compass consists of a black or red-brown molded material such as bakelite, modeled after the P37 uniform button. Black was for RAF uniforms, red-brown for the Army. The button is ” (19,05 mm) diameter x ” (3,81 mm) thick. The periphery is rounded and the outer surface has a ” (1,02 mm) dimple in its center. A nickeled brass pin made of ” (1,27 mm) diameter wire passes through the center of the button from the outside surface, with the pin headed part being on the outside. The pin is formed into a closed loop on the back side.