I worked at what was called the "Navy Arms Booth" at the Spring and Fall National Championship most of the years from 1974 until they set up their own separate Sutler's Booth. We still handled NA guns when I stopped in 2005. We always referred to the guns by either the Importer's Brand or the actual Italian Manufacturer such as Armi San Marco, Armi San Paolo, etc.
If you can give me the name of the manufacturer, I.E. Armi San "Whatever", I can probably give you an idea when Navy Arms started selling them.
Gus