Walker and Hall oil lamp

Hi

I recently purchased this at an antiques fair simply because I loved it. It has a marking for Walker and Hall on the base and the flag mark as well as the serial number 51269. the burner also has hicks and son birm on it. It stand approx 27cm tall and 7cm wide and is in perfect condition and works well. Can you tell me what this might be worth and anything about the company names and possible era of this piece.

Many thanks

Helenk1
lamp 2.JPG

Its quite an unusual piece. There should be another piece of glass which is usually globe shaped and frosted. This goes around the bottom part of the central tall glass and diffuses the light.

Its late victorian and I reckon it about £50 - £75.