These inscriptions merely advertise the source of the steel used in making the barrels. Translated it reads: "First class gun barrel steel by Krupp (steelworks) in Essen (city)". We need all markings under barrels, on watertable and, perhaps, on breechface. Maybe these markings will allow to identify the real maker, but at least they will serve to identify if Suhl or Zella-Mehlis, caliber and date. PM sent.