Here we have a WWII-era pneumatic Directional Gyro/Turn Indicator made by Jack & Heintz. According to the Maintenance Interchangeability Cross Reference Charts of the Air Forces US Army, the AN-5735 Directional Gyro was used across nearly all aircraft of the US Army Air Force and US Navy during WWII.

This unit is equipped with a vacuum-driven gyroscope with its operating range limited to 55 degrees climb, dive, or bank. It is mounted on the instrument panel in the pilot's compartment and connected through a vacuum gage and selector valve to a source of vacuum, either an engine driven air pump or a venturi pump.