I don't know exactly what it is but I like it. But I'll give you something to think about. The style of the eagle with what appear to be cannons, along with the shield, wreath, stars and rays all suggest military to me, early military. The design is pre Civil war era. I'm thinking 1812 era, cockade eagle hat device, an early Dragoon regiment maybe. I know some of the earlier devices were struck in pewter and some with thin brass and lead filled backs with double wire fasteners on the back. That's my two cents for what it's worth.
edit- Nevermind i'm a day late and a dollar short as usual.