This original World War II-era British Royal Air Force (RAF) Type P8.M grid steering aircraft compass (Serial No. 148556 B) was a standard and vital navigation instrument manufactured in the late 1930s and 1940s for iconic Allied fighter and bomber aircraft, including the Supermarine Spitfire and Hawker Hurricane. Designed for high-vibration environments, the unit features a rotatable outer course-setting ring, horizontal grid lines, and a directional indicator marked with "AFT" to denote its rearward mounting orientation. The piece shows an authentic, aged patina with minor paint loss and surface wear consistent with historical military service, and while the original dampening fluid has evaporated over time, the mechanical grid ring and lock lever remain intact, making it an exceptional display piece for aviation collectors and militaria enthusiasts alike.