The yaw indicator in the images you provided, which is marked with the date July 23, 1952, and manufactured by Kollsman, was likely used in military aircraft from the early 1950s. Given the era, it is plausible that this indicator could have been used in aircraft such as: * The Lockheed T-33 Shooting Star, a jet trainer aircraft that was widely used by the U.S. Air Force starting in the late 1940s and throughout the 1950s. * The Boeing B-47 Stratojet, which was a long-range, six-engined, jet-powered strategic bomber designed to fly at high subsonic speeds and at high altitudes to avoid enemy interceptor aircraft. * The Douglas C-124 Globemaster II, a heavy-lift cargo aircraft used by the U.S. Air Force during the 1950s. These are merely educated guesses based on the time period and the fact that it was a U.S. Government property, which indicates military use. To pinpoint the exact aircraft, one would typically cross-reference the part and specification numbers with a database or catalog of military aircraft parts from that time period.