I wonder if the pistol was bought, Maybe as part of a batch by a company that used their own serial numbers for their stock and was nothing to do with Webley or someone trying to pass the gun off as an earlier model!!
I have a pre war Mk1 (Wooden grips) that has a barrel that looks more like the later ones, Maybe a bitsa but i'm sure I can recall someone telling that they made a small amount with the shorter barrel (No over hang!)..
Pic 1
Pic 2
Pic 2 shows the barrel length that is normal for the mk's that i've seen before, Does anyone know whether the shorter barrel is from a later pistol or would it have been with the barrel from new??
I think the later barrels all had the knurling as the later one in pic2 (not 100% sure though
)
John