This is a wonderful antique large and heavy bent slag glass lamp. It is not signed, as far as I can tell. 

The lamp stands 23 3/4 inches tall on about an 8 inch diameter base. The shade is 17 to 19 inches in diameter depending on where you measure and is 9 inches tall. 

It is a beautiful antique ivory white lamp with golden highlights  and with molted caramel bent slag glass . The shade and glass are complete and look just great. There are a couple small filigree pieces missing on the shade, but they appear to just not have been cast when the shade was made rather than broken off. They do not affect the looks of the lamp at all. The shade may have been repainted or touched up in the past. There are a couple of small chips to the finish at the very bottom of the base and by one of the joints. Again, not affecting the looks of the lamp. The lamp has been correctly rewired and works perfectly.  This is a great looking lamp and quite heavy.  It is just a wonderful lamp for your home, period and original.