Astro Compass, Mk II, Sperti, for Parts or Repair

This WWII-era Astro Compass, Mk II, was used for celestial navigation and is being sold as is for parts or repair. 

The Astro Compass was used across many versions of US Army Air Force aircraft with navigator crew during the era, such as bombers B-17 Flying Fortress, B-24 Liberator, and B-29 Superfortress, and transports C-46 Commando, C-47 Dakota, and C-54 Skymaster.  The compass would be placed in a fixed mount on top of the instrument panel or in the navigators compartment, and sighted to a known star, e.g. North Star. The bearing of the aircraft can then be determined by using/aligning the indexing scales on the components of the Astro Compass.

The spirit levels are missing, and the white Delineation labels are warped. We do not know if the rest of the device is operable.