Mom gave me this lamp years ago. Hippie cleaned it up. There is a tiny crack in one of the panes of glass. She had it for years and years. The base is very heavy. Mom says its brass but we're not sure. I can't even pick it up. As far as I can tell there are no markings on it to tell me where it was made. Anyone have any ideas of how I could find out? It sits on the end table next to the couch.