The acronym for Destro is DS. I worked at a Fiat dealership for 24 years and it was DS (right) and SN (left), and GD for right steering and GS for left steering.

I was concentrating on the little crosses at the beginning and end of the inscription and thought they looked a lot like the Order of Christ. ie. Knights Templar. Then I came across this page: https://darksword-armory.com/product/two-handed-templar-sword-1339/ At the bottom of the page is the exact same sword, only in much poorer condition. "Photograph of the original sword 1300 – 1350 A.D Museum of London, England." And I read the inscription as follows: N D X O X G H W D N C H D X O R V I Whatever the inscription means, it's probably a Christian phrase of some sort.