i'll add an opinion regarding the question of the source of the action;
several pages back, in some of your photos, there are two different serial numbers shown. one is a four-digit number that is repeated on several parts, the other appears to be 56555. numerous of the market supplied actions will display double serial numbers - one from the firm that produced the action, the other from the concern that finished and sold the completed gun. i would wager that the four-digit is the baker number - and that the 56555 is a webley-scott production number. that would put production of the action in 1899, after the amalgamation of webley and scott, when the screw-grip action was widely marketed, in the time period when damascus barrels were frequently nitro proofed, and during a fairly short interval when overhanging sears were not uncommon on their guns.
i have a 1902 webley screw-grip with both nitro proofed damascus, and overhanging sears - built for mahillon in brussels
