Congratulations, Rob, a very interesting and beautiful sword.
We discussed these hallmarks:
http://www.vikingsword.com/vb/showthread.php?t=30639
JOURNAL OF THE SOCIETY OF HISTORICAL WEAPONS
HISTORICAL WEAPONS No. 1 2015
EDUARD von LENZ
A FEW WORDS ABOUT ANCIENT COLD WEAPONS
Page 150-151
IV. Italian Masters. "Gurda".
The Italian masters, in contrast to the Solingen and German masters in general, comparatively rarely branded their blades, and if they did, they usually used small marks of a simple form (Fig. 11), which, as far as is known, belonged to the workshops of the cities of Genoa, Brescia, Milan and Belluno and did not constitute the personal property of certain masters.