The 'rough forged tubes' may have been sourced from Liege.
Thomas Webley c. 1879 in John Henry Walsh's The Shotgun
"Quite three-fourths of the tubes used in Birmingham are Belgian make, and nearly all the London trade use them."
c. 1890 James Purdey II wrote that he favored Belgian damascus because "...not that when thorough sound English damascus can be obtained they are not superior, but because Belgian workmen are more careful than English, and there is thus less risk of slag and rubbish getting into the welds."
W.W. Greener, The Gun and Its Development
"The very best barrel-makers who manufacture for the London, Berlin, and Vienna markets are to be found at Chaudfontaine or Nessonvaux, both places a few miles from Liege."
