Compass, Magnetic, US Military Vehicle, Pioneer 1829-2-A C-46 Handwritten overhaul markings are on

Handwritten overhaul markings are on the back

It has a date stamp of Dec 1956 on the side case

From our friend Laurent at Aircraft-Gunsights

and "МАСЛО ОПАСНО"  means Oil

Compass, Magnetic, US Military Vehicle, Pioneer 1829-2-A C-46 Handwritten overhaul markings are onThe Pioneer 1829 2 A Magnetic Compass was used in various US military vehicles and naval craft during WWII. It has a screw type heeling compensator, a removable drawer type compensator, a screw type horizontal compensator, and a spider type compensator, all for the elimination of errors caused by magnetism. Has a constant deviation corrector and a course setter. With a rotatable dial engraved with the compass card graduations. The compass mounted