Dating the Schiavons sword

[Cathey]

I am attempting to bring my article for the Heritage Arms Society on the Schiavona to the finish line, then I found a reference to a metal rain cap. Has anyone heard of these before or have any reference material on them they would be prepared to share. Here is a picture of one. It appears to be a metal shaped plate fitted to the bottom so the guard with screws, I can't find any mention of it in my existing references other than a book by Andrew Garcia.

Cheers Cathey