US Army Air Forces Astrograph Type A1 Sperti Military

Astrograph Type A-1, Tag states Property U.S.Army Air Forces. Spec No. 27404, Contract No. W535-AC-3422, Manufactures Assembly No. A 12,Sperti Inc Cincinnati, O USA. Comes with description and operating instructions. In the box is a wrench and some other tool and 3 bulbs shown in picture. Tag on the box matches the numbers on the unit. 2 of the mounting hooks are broke (see the picture)