Robert-Jean Charles in ÉTUDE SUR LES ÉPÉES DU MOYEN ÂGE AU 17° SIÈCLE
http://www.bertrand-malvaux.com/fr/p...70-siecle.html
Focuses on the early evolution of the sword guard in the late XVth early XVIth century. Taking into account especially Iberian examples. He has nothing like your guard.
Not in Norman, Rapier, and Smallsword. Not in Seitz. Not in Ada Bruhm.
On the other hand, this is the equivalent piece a cup hilt would have without the bell...
The closest example i find is the XVI century hilt El Cid Tizona blade has: