This Richard-Ginori Weitschirm, rescued by my friends and received from today's meeting, got the extremely rare marking with the six-numbers F.S. (Italian State Railroad Co.) code.
It's the first time that I see this marking on Weitschirm insulators rescued from dismantled F.S. railroad lines, being more common on other types like the telephone models FT 92 and FT 120 once used by the F.S. for telephone or signal lines.