The Modern Sportsman's Gun and Rifle: Including Game and Wildfowl Guns, Sporting and Match Rifles, and RevolversJohn Henry Walsh (Editor of
The Field) 1882
http://books.google.com/books?id=OLwUAAAAYAAJI am indebted to Mr. Thos. Webley, who visited Belgium after the 1879 Trials, with a view to discover the reasons why the barrels forged there are more free from flaws than those made at Birmingham.
"We were, in common with our competitors, excepting for first and second quality, using a large proportion of these tubes; in fact, we think that quite
three-fourths of the tubes used in Birmingham are Belgian make, and nearly all the London trade use them, with this difference, that they use the best quality, which are no doubt harder than the cheaper kinds, but are still softer and less durable than those of English make, and cost as much."
It appears what remain of a crown is on the left barrel just aft of the hanger, and was likely the Belgian tube maker's mark. The 'Laminated Steel' barrels are Twist BTW.