On top could be various phrases in various languages. Here's a few German examples:
Flustahl Krupp Essen
Kruppscher Flustahl
Prima Flustahl
Lauf-Stahl Krupp AG Essen(Post 1909).
But on the underside of the tubes, the mechanic who converted the tube from Krupp bar stock, more than likely applied the phrase in the language of the recipient of the rough bored tubes. Maybe circa 1909 was the time when Krupp passed & since he didn't have a male heir or assign, that the term Essen was dropped? The company was converted to a shareholder variant.
Maybe the mechanics @ Liege just lost the Essen die?
Krupp was an odd duck, more than likely had a few nuts backed off or may have even lost some of his marbles. He believed that the scent of fresh horse manure led to creative thinking. So he had that horse quarters built adjacent to his quarters and piped in the scent to his room sealed by steel doors. Piped it in w/ Krupp Flustahl tubes....
Cheers,
Raimey
rse
