WWII U.S. Army Air Corps/Force Sterling Silver Ring
This is an original WWII U.S. airman's private purchase ring. Its interior is marked "STERLING", which denotes .925 silver purity. Also marked in the ring's interior are the scratched initials "GJ" and "RR" - perhaps those of its original owner and his sweetheart? It features an open, overlapping back, which accommodates numerous ring sizes.