Picked up Akehurst's
Game Guns & Rifles from our library. Unfortunately, the images are not of adequate resolution to scan and reproduce (and it's still in Copyright

) But this helps
"Stub Damascus"...was made from a quantity of old files, heated red hot and rendered hard and brittle by quenching in cold water, after which they were pounded to the size of No 5 shot and a proportion of 15 lb of these added to 25 lb of stubs. The mixture was fused together on the bed of an air-furnace, hammered to condense the metal and rolled into rods 3/8 inch square. These rods were twisted and treated as for Damascus, the effect being of a mottled twist.
Despite W.W. still using the term in 1907, it certainly must have been an early English damascus product, and likely looks like laminated steel (with
alot less steel!)