Syracuse Arms and Hollenbeck Gun Co. And LC Smith didn't catalog Krupp barrels after 1905; but I've seen an Ideal Grade and an A2 Grade with Krupp barrels, both produced during WWI. On the Ideal the Krupp trademark had been over-stamped "London Steel". With the A2 the shipping records noted the barrel steel type as being "Krupp", but the Krupp trademarks on the bottom of the tubes had been carded off; and atop the barrels Hunter had engraved the words "Monogram Steel". Who knows but I suspect German products might not have been held in high esteem during WWI, therefore trademarks were either obscured or removed.
