Signed Hobe Mystery

I'm not sure if this is part of something or a stand alone piece. It doesn't look as though it has broken off of anything or was ever a brooch or pendant, although it would be kind of heavy. The bottom is such that the piece does not stand on it's own. I've looked and looked but cannot find anything like it to compare it to. If you have any idea where this item came from or where I can research it's history, please help. Thanks so much!