Im just getting here to check it out dude.And here's what I think you might have.Now Ive never seen one of these before so thats a cool find already.But as you can tell it has the Great Seal motif/eagle on it.So that tell's me that this piece dates from 1902 to Present.
Also I know that the US part under the Eagle was strictly used for Officers as the US was utilized on a disk.So, I'll keep trying to research this out for you as I think its a cool find,nice job dude.Daniel
Im wondering if it was used in the same fashion as whats on the web link I sent ya,and If so maybe the eagle part broke off the face of someting similar?