Well, you see many different phrases, some atop some not. I contend that the Belgian were applying the phrases with their own die set.

Some other phrases are:
"Canons Acier Krupp", "Acier Anglais", "Excelsior Stahl Witten"(in block form) coupled with "Marke Alder"(on the underside is something like Acier Special C??), "Krupp'scher Flussstahl"(I think this one to be German inland)

And regarding Krupp, by the mid 1880s one sees the term "Krupp'scher Kanonenstahl" when seems to gain traction catapulting Krupp to the forefront of alloys and their footprint stretches to weapons centres like Liege & Terni.

Kind Regards,

Raimey
rse