Lancaster Antiques has dated this piece to the 1910s.
It measures 47cm in height, with a 16cm in diameter base and the shade is 23cm in width.
The initials GR with a faded symbol can be seen on the edge of the base (shown in photograph 2) and is probably the Maker's mark. Although we can't trace the exact firm, we suspect it was made in Birmingham where a lot of good quality lighting from that period was made.

It is a fine quality lamp with a weighted base (newly felted) and it has a replacement glass shade, and it is in excellent condition.
The price includes postage and package within the UK mainland only.
Lancaster Antiques has dated this piece to the 1910s.
You can view the stock and full dealer information on the Lancaster Antiques Profile Page