Hang on! I may have found something: The one shown is in silver but appears to be a Luftwaffe pin. ns618 Large 3 inch nazi Airforce flying eagle metal with double pin backs - 24800 For Sale
It's a Luftwaffe officer chest eagle and they do exist both in silver and gold color. They go on the right sight of officers uniforms or on leather jackets. If genuine (hard to tell from the quality of the picture) it's worth about 60-150 $ , according to quality or maker markings on the back. There are many fakes on the market, so beware, but yours looks pretty nice at first sight.
