Hi, Doc,
I am not sure which markings you mean, but an idiotic rule called the Gun Control Act of 1968 requires that importers put their name (or an approved abbreviation) on the gun, and the caliber. That was put into the law because it took several days to learn the importer of the Carcano rifle used by Oswald to kill JFK. For sporting arms, the factory usually puts on its name and location, plus the name of its authorized importer, but military surplus arms obviously don't have a U.S. importer's name on them and very rarely have the caliber marked (armies usually know what ammo they issue).
Jim