Unless the order book that contains your gun has been lost, William Evans may be able to provide provenance on your gun. A great number of Evans shotguns were built on the Webley screw grip action, probably sourced from Webley. The serial number ranges available for research are listed in Nigel Brown's London Gunmakers. His indication is that the 1899 guns are generally available for research. A recent post by Diggory Hadoke, known as "smallbore" on this forum, indicates that William Evans generally did not build guns, only operated a gun shop.