Lancaster Antiques has dated this piece to the 1920s.
It is 27.5cm in height and approximately 21cm across and is in very good condition.
The Lucas trademark at the top reads:

Lucas
King Of The Road Reg No. 635157-8
J&S Lucas Ltd. B'ham.
On the three pieces of the lamp on one side are the embossed initials LNWR - see last photo.
On the base is a brass plate with the instructions 'DO NOT FILL CARBIDE ABOVE THIS GROVE'.
Lancaster Antiques has dated this piece to the 1920s.
You can view the stock and full dealer information on the Lancaster Antiques Profile Page