I'd take most of what he pens with a large grain of iodized salt. Anyway I believe the phrase from an article on Ithaca's importation of tubes read something like the following:

"the Krupp Essen fluid steel barrels with their stamped trademark showing little soldier holding a gun"

From what I can glean, the certificate that accompanied the Whitworth & Sauer Spezial Weapons Grade Steel was a document that guaranteed that at any point if a failure occurred, the manufacture was bound to replace them.

Kind Regards,

Raimey
rse