Nice old light with great patina. See images for size and condition. I think I have those covered well. This is copper, tested with magnet and only would attach to the added galvanized nuts at the mounting plate., Not sure of exact age, Only history I know is that it came from a local Lake Michigan Estate. has old cloth wiring. The mounting plate is notched for large beveled siding, someone added an on/off switch to use this indoors as a lamp. There are 2 added nuts to secure the light to the mounting plate, I assume it was either threaded to the plate or soldered and needed reinforcing. It does have some bends/kinks to the decorative parts, missing 5 pieces of glass (the one is held in place with caulk). There are 6 sides but only 3 upper clips to hold the glass, not sure if 3 are broken off or it was designed this way. Bottom has no method to hold glass. I tested it and it works but there is some tape on the wires and this should be rewired for safety.