German WWII Luftwaffe Pilot's Wrist Compass

German WWII Luftwaffe pilot's wrist compass.  This is the liquid filled compass worn by pilots, and bomber crews.  The condition is excellent and may be unissued.  Black leather two section strap, Plastic compass the main body of the compass is is made of bakelite material.  The back is marked AK 39 and Fi 23235-1.  Very nice!