Azimuth Circle, Azimuth Ring for Magnetic Compass also called: Azimuth Mirror, Azimuth Device
original U.S. Navy equipment (USN Bureau of Ships Mark 3 Mod 2 1943) vintage WWII era marine nautical antique collectible with original wood storage case & misc. paperwork made by The Lionel Corp. NY (makers of Lionel model train sets)
size: 10 inches (diameter)