Unless it was cobbled together recently from old components, I still contend it is from right around WWI. Not sure why, but the Italians commenced sourcing the mechanics @ Liege about this time & at first the advertising was in French & followed by Italian:

Fucile Rinforzato Speciale Per Polveri Bianche

There are just too many Acier Mannesmann...... that landed up in Italy for those to not be inland production of foreign components.

Cheers,

Raimey
rse