424-1, C661022-0103, Cessna Autopilot Slaved Directional Gyro

3 1/8" Cessna Autopilot Slaved Directional Gyro. Manufacturer P/N 424-1. Cessna P/N C661022-0103. Visually it checks out ok but I do not have any information on the history of it and air vent plate is also broken, (see photo). Condition, as removed, untested. Sold as a core ONLY, as is, no returns.