The pictures show a front and back view of this UnitedStates Navy Officer Sterling Silver & Gold Filled Insignia Pin. This would be a smaller hat device or pin for a garrison hat for commissioned and warrant officers. The pin is not dated and the year that it was made is unknown. It has a sterling silver (left facing) eagle and shield and gold filled anchors. It is marked on the back as follows:
GEMSCO STERLING - 1/20 10 KT. G.F.
The insignia pin measures about 1-1/8'' x 1-1/8''. It appears to be in mint condition as pictured.