US WWII Army Air MILITARY RING Sterling, Prop & Wing on Mother of Pearl size 11

  
Vintage Sterling wearable pre-owned United States WWII Army Air MILITARY RING - size 11 - I have been told the Propeller and Wings originated as the branch insignia of the US Army Air Service in 1920 and that versions of the insignia are still being used by the United States Air Force and the United States Army Aviation Branch. The inside of the ring is STAMPED - best that I can read: "STERLING & 1/20 12 K G F" first two letter I can not make out - See pictures, maybe you can make the first two letters out. Ring is sterling with 1/20 12 K G F propeller and wings set on mother of pearl. See picture for conditions - feel free to ask questions.