antique art nouveau vintage brass or bronze leaf wall sconce reflector

Large antique art nouveau vintage brass or bronze wall sconce reflector. It measures about 17" high, 13" across and 2 1/2" deep. It has a coiled tendril mounting arm for a lamp burner or candle holder (there is a small threaded hole) and a tab on the back of the reflector for hanging it on the wall. It is marked "527".

This brass or bronze reflector has a lovely patina of age and tarnish, but there is no burner or candle holder, just the reflector.