Delcour-DuPont survived WWI relatively intact. They were the last of the large production houses to produce damascus barrels, circa 1939.
From about 1905 to 1919 most fluid steel coming out of Belgium, especially FN, was produced by Siemens-Martin, this was during a period of German control and acquisition of Belgian arms manufacturing. Gaier refers to this period as "the German School." In "Ars Mechanica" there is a picture of the FN board room, with German officers in uniform seated at the table.
Damascus imports from Belgium basically stopped during WWI. Baker as much as says so. Yet we see a number of American makers still able to fulfill orders. My best guess is that they had stored a large quantity of tubes before the war or a jobber had. I believe this would apply to Krupp as well.
Pete
