I was just about to ask the same question as albanygun
If the name is in fact G E Lewis there is some history on them.
Reading from my best reference book : - " George Edward Lewis (1829-1917), Gun and Riflemaker at Bath Street, 1850, Lower Loveday Street 1859 - 1908. (Both Birmingham).
In 1909 they became George E Lewis & Sons until 1989 and by 1996 had moved out of the Birmingham gun quarter to Halesowen.
Among the guns they produced was "The Ariel" lightweight weighing from 5 3/4Lb to 6Lb. The style and engraving is quite similar to the gun illustrated here.
Found another section in the reference book with a listing of serial numbers by date. If we are in fact looking at GE Lewis post the serial # and I can give you a date for it.
Value on these old guns is nearly impossible to decide without a hands-on examination. This gun was Nitro proofed when new but is it still in proof or have the bores been honed out to get rid of pitting ? Another area (that is not included in proof status) is barrel wall thickness where the wall may have been eroded from the outside by successive reblacking or struck off to remove dents etc. Another problem that seems to come up in the US is that the chambers have been lenghtened to 2 3/4", again that would put the gun out of proof.
Bottom line, it needs to be examined by a competent gunsmith in your area to arrive at a realistic value..