WWI Dated 1917 Eng.Dept.Compass USANITE

This is a nice working undamaged WWI compass. It still points true north. The outside of case has no damage, only normal use wear, see photo. It has spotting on the inside around face, see photos. The face is marked USANITE, Pat. Apr. 20 1915, see photos. The case closes tight and opens easy. Not perfect but a very nice example of a widely used compass by WWI soldiers and probably some in WWII. ANY QUESTIONS, PLEASE ASK.