Germany. A "Norway 1940" Luftwaffe Man's Silver Ring

A very finely crafted ring, a rather large man's size (approximate N. American size 10), in solid silver (marked inside of the ring "830 S J.J.), and also hand engraved inside ""Stavanger" (presumably wearer's name), with very finely detailed Luftwaffe eagle; in worn condition, and of very good quality manufacture.